Highest Voted 'spam-prevention' Questions

120

votes

25 answers

What is the best way to programmatically detect porn images?

Akismet does an amazing job at detecting spam comments. But comments are not the only form of spam these days. What if I wanted something like akismet to automatically detect porn images on a social networking site which allows users to upload their…

spam-prevention

asked Apr 03 '09 at 09:39

Raj

6,720
6
46
55

74

votes

3 answers

Better Honeypot Implementation (Form Anti-Spam)

How do we get rid of these spambots on our site? Every site falls victim to spambots at some point. How you handle it can effect your customers, and most solutions can discourage some people from filling out your forms. That's where the honeypot…

forms spam-prevention honeypot

asked Mar 25 '16 at 20:17

Nicholas Summers

3,611
2
16
32

63

votes

19 answers

Hunting cheaters in a voting competition

Currently we are running a competition which proceeds very well. Unfortunately we have all those cheaters back in business who are running scripts which automatically vote for their entries. We already saw some cheaters by looking at the database…

php spam-prevention voting

asked Feb 25 '10 at 09:51

Bosh

1,227
1
16
23

41

votes

6 answers

Publicly Available Spam Filter Training Set

I'm new to machine learning, and for my first project I'd like to write a naive Bayes spam filter. I was wondering if there are any publicly available training sets of labeled spam/not spam emails, preferably in plain text and not a dump of a…

machine-learning spam-prevention training-data

asked Jan 20 '11 at 06:08

JeremyKun

2,879
2
20
42

40

votes

6 answers

How to detect fake users ( crawlers ) and cURL

Some other website use cURL and fake http referer to copy my website content. Do we have any way to detect cURL or not real web browser ?

php curl spam-prevention

asked Sep 04 '12 at 05:59

Ken Le

1,740
2
21
33

37

votes

13 answers

Detecting a (naughty or nice) URL or link in a text string

How can I detect (with regular expressions or heuristics) a web site link in a string of text such as a comment? The purpose is to prevent spam. HTML is stripped so I need to detect invitations to copy-and-paste. It should not be economical for a…

language-agnostic url sanitization spam-prevention

asked Mar 31 '09 at 05:46

JasonSmith

68,848
21
119
147

35

votes

14 answers

Spam Prevention/Reduction - Contact Form?

I want to add a simple Contact form to my web site so that customers can contact me easily.

NAME EMAIL MESSAGE

<input…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/javascript" class="post-tag grid--cell" title="show questions tagged 'javascript'" rel="tag">javascript</a> 
                
                <a href="../../questions/tagged/html" class="post-tag grid--cell" title="show questions tagged 'html'" rel="tag">html</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Feb 09 '10 at 16:04">asked Feb 09 '10 at 16:04</time>
    <a href="../../users/269618/billk" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/269618.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="BillK" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/269618/billk" class="s-user-card--link">BillK</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">371</li>
            <li class="s-award-bling s-award-bling__gold" title="1 gold badge">1</li>
            <li class="s-award-bling s-award-bling__silver" title="4 silver badge">4</li>
            <li class="s-award-bling s-award-bling__bronze" title="5 bronze badge">5</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-3622433">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>32</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>4</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/3622433/how-effective-is-the-honeypot-technique-against-spam" class="question-hyperlink">How effective is the honeypot technique against spam?</a></h3>
        <div class="excerpt">By "honeypot", I mean more or less this practice:
#Register form
<style>
    .hideme{
        display:none;
        visibility: hidden;
    }
</style>
<form action="register.php">
    Your email: <input type="text" name="u-email" />
    Choose a…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/php" class="post-tag grid--cell" title="show questions tagged 'php'" rel="tag">php</a> 
                
                <a href="../../questions/tagged/spam" class="post-tag grid--cell" title="show questions tagged 'spam'" rel="tag">spam</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
                <a href="../../questions/tagged/honeypot" class="post-tag grid--cell" title="show questions tagged 'honeypot'" rel="tag">honeypot</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Sep 01 '10 at 21:57">asked Sep 01 '10 at 21:57</time>
    <a href="../../users/80363/strae" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/80363.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Strae" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/80363/strae" class="s-user-card--link">Strae</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">17,313</li>
            <li class="s-award-bling s-award-bling__gold" title="26 gold badges">26</li>
            <li class="s-award-bling s-award-bling__silver" title="89 silver badges">89</li>
            <li class="s-award-bling s-award-bling__bronze" title="129 bronze badges">129</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-21421948">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>32</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>13</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/21421948/protect-e-mail-address-with-css-only" class="question-hyperlink">Protect e-mail address with CSS only</a></h3>
        <div class="excerpt">I want to protect my e-mail address on webpages. 
But I don't know JavaScript and PHP. I know only HTML and CSS. 
So, please help me how to protect my email address with CSS only.
</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/html" class="post-tag grid--cell" title="show questions tagged 'html'" rel="tag">html</a> 
                
                <a href="../../questions/tagged/css" class="post-tag grid--cell" title="show questions tagged 'css'" rel="tag">css</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
                <a href="../../questions/tagged/email-address" class="post-tag grid--cell" title="show questions tagged 'email-address'" rel="tag">email-address</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card__deleted">
    <time class="s-user-card--time" datetime="asked Jan 29 '14 at 04:14">asked Jan 29 '14 at 04:14</time>
    <div class="s-avatar s-avatar__32 s-user-card--avatar">
    </div>
    <div class="s-user-card--info">user3087089</div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-111576">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>26</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>27</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/111576/when-the-bots-attack" class="question-hyperlink">When the bots attack!</a></h3>
        <div class="excerpt">What are some popular spam prevention methods besides CAPTCHA?
</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/security" class="post-tag grid--cell" title="show questions tagged 'security'" rel="tag">security</a> 
                
                <a href="../../questions/tagged/captcha" class="post-tag grid--cell" title="show questions tagged 'captcha'" rel="tag">captcha</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
                <a href="../../questions/tagged/bots" class="post-tag grid--cell" title="show questions tagged 'bots'" rel="tag">bots</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Sep 21 '08 at 18:13">asked Sep 21 '08 at 18:13</time>
    <a href="../../users/17162/jose-vega" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/17162.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Jose Vega" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/17162/jose-vega" class="s-user-card--link">Jose Vega</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">9,800</li>
            <li class="s-award-bling s-award-bling__gold" title="7 gold badges">7</li>
            <li class="s-award-bling s-award-bling__silver" title="37 silver badges">37</li>
            <li class="s-award-bling s-award-bling__bronze" title="56 bronze badges">56</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-3743928">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>25</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status ">
                <strong>9</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/3743928/stop-spam-without-captcha" class="question-hyperlink">Stop spam without captcha</a></h3>
        <div class="excerpt">I want to stop spammers from using my site. But I find CAPTCHA very annoying. I am not just talking about the "type the text" type, but anything that requires the user to waste his time to prove himself human.
What can I do here?
</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/captcha" class="post-tag grid--cell" title="show questions tagged 'captcha'" rel="tag">captcha</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Sep 18 '10 at 23:26">asked Sep 18 '10 at 23:26</time>
    <a href="../../users/451657/unreal" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/451657.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="unreal" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/451657/unreal" class="s-user-card--link">unreal</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">303</li>
            <li class="s-award-bling s-award-bling__gold" title="1 gold badge">1</li>
            <li class="s-award-bling s-award-bling__silver" title="3 silver badge">3</li>
            <li class="s-award-bling s-award-bling__bronze" title="5 bronze badge">5</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-4794286">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>24</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>10</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/4794286/what-s-the-best-way-to-present-an-e-mail-address-on-my-website-without-being-a" class="question-hyperlink">What's the best way to present an e-mail address on my website without being attacked by spammers?</a></h3>
        <div class="excerpt">What's the best way to present an e-mail address on my website without being attacked by spammers?
The approach foo at fooland dot com is not exactly what I'm looking for. I need to present it in a way that is comprehensible for normal…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/html" class="post-tag grid--cell" title="show questions tagged 'html'" rel="tag">html</a> 
                
                <a href="../../questions/tagged/webforms" class="post-tag grid--cell" title="show questions tagged 'webforms'" rel="tag">webforms</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Jan 25 '11 at 13:52">asked Jan 25 '11 at 13:52</time>
    <a href="../../users/192729/andre-pena" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/192729.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="André Pena" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/192729/andre-pena" class="s-user-card--link">André Pena</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">48,518</li>
            <li class="s-award-bling s-award-bling__gold" title="37 gold badges">37</li>
            <li class="s-award-bling s-award-bling__silver" title="172 silver badges">172</li>
            <li class="s-award-bling s-award-bling__bronze" title="216 bronze badges">216</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-20862728">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>24</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status ">
                <strong>3</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/20862728/reliably-detecting-phantomjs-based-spam-bots" class="question-hyperlink">Reliably detecting PhantomJS-based spam bots</a></h3>
        <div class="excerpt">Is there any way to consistently detect PhantomJS/CasperJS? I've been dealing with a spat of malicious spambots built with it and have been able to mostly block them based on certain behaviours, but I'm curious if there's a rock-solid way to know if…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/phantomjs" class="post-tag grid--cell" title="show questions tagged 'phantomjs'" rel="tag">phantomjs</a> 
                
                <a href="../../questions/tagged/mediawiki" class="post-tag grid--cell" title="show questions tagged 'mediawiki'" rel="tag">mediawiki</a> 
                
                <a href="../../questions/tagged/casperjs" class="post-tag grid--cell" title="show questions tagged 'casperjs'" rel="tag">casperjs</a> 
                
                <a href="../../questions/tagged/spam" class="post-tag grid--cell" title="show questions tagged 'spam'" rel="tag">spam</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Dec 31 '13 at 20:11">asked Dec 31 '13 at 20:11</time>
    <a href="../../users/3150134/terrakin" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/3150134.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Terrakin" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/3150134/terrakin" class="s-user-card--link">Terrakin</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">241</li>
            <li class="s-award-bling s-award-bling__gold" title="1 gold badge">1</li>
            <li class="s-award-bling s-award-bling__silver" title="2 silver badge">2</li>
            <li class="s-award-bling s-award-bling__bronze" title="3 bronze badge">3</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-26452716">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>22</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>2</strong> answers
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/26452716/how-to-create-a-nuclear-honeypot-to-catch-form-spammers" class="question-hyperlink">How to create a "Nuclear" honeypot to catch form spammers</a></h3>
        <div class="excerpt">My current honey pot on my registration form is an entry for phone number which is placed off screen using position: fixed;. 
It tricked a standard breed form filler, but doesn't work as well as I though. Also, the spambots immediately responded to…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/forms" class="post-tag grid--cell" title="show questions tagged 'forms'" rel="tag">forms</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Oct 19 '14 at 16:32">asked Oct 19 '14 at 16:32</time>
    <a href="../../users/2926289/giantcowfilms" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/2926289.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="GiantCowFilms" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/2926289/giantcowfilms" class="s-user-card--link">GiantCowFilms</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">893</li>
            <li class="s-award-bling s-award-bling__gold" title="1 gold badge">1</li>
            <li class="s-award-bling s-award-bling__silver" title="14 silver badge">14</li>
            <li class="s-award-bling s-award-bling__bronze" title="23 bronze badge">23</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>
                
                    <div class="mln24">
                    <div class="question-summary" id="question-summary-32184742">
    <div class="statscontainer">
        <div class="stats">
            <div class="vote">
                <div class="votes">
                    <span class="vote-count-post"><strong>21</strong></span>
                    <div class="viewcount">votes</div>
                </div>
            </div>

<div class="status answered-accepted">
                <strong>1</strong> answer
            </div>
        </div>
    </div>
    <div class="summary">
        
        <h3><a href="../../questions/32184742/do-subdomains-protect-a-domain-s-reputation-when-sending-emails" class="question-hyperlink">Do subdomains protect a domain's reputation when sending emails?</a></h3>
        <div class="excerpt">I'm working on an application that is meant to distribute emails by the thousands.  We've started interfacing with Mandrill to accomplish this.
So my coworker suggests that we use a subdomain to send all of theses emails out, so as to protect our…</div>
        <div class="grid ai-start jc-space-between fw-wrap">
            <div class="grid gs4 fw-wrap tags ">
                
                <a href="../../questions/tagged/email" class="post-tag grid--cell" title="show questions tagged 'email'" rel="tag">email</a> 
                
                <a href="../../questions/tagged/subdomain" class="post-tag grid--cell" title="show questions tagged 'subdomain'" rel="tag">subdomain</a> 
                
                <a href="../../questions/tagged/spam" class="post-tag grid--cell" title="show questions tagged 'spam'" rel="tag">spam</a> 
                
                <a href="../../questions/tagged/mandrill" class="post-tag grid--cell" title="show questions tagged 'mandrill'" rel="tag">mandrill</a> 
                
                <a href="../../questions/tagged/spam-prevention" class="post-tag grid--cell" title="show questions tagged 'spam-prevention'" rel="tag">spam-prevention</a> 
                
            </div>
            <div class="started mt0">
                
                    
<div class="s-user-card s-user-card">
    <time class="s-user-card--time" datetime="asked Aug 24 '15 at 14:24">asked Aug 24 '15 at 14:24</time>
    <a href="../../users/4641017/captain-hypertext" class="s-avatar s-avatar__32 s-user-card--avatar">
        <img class="s-avatar--image" src="../../users/profiles/4641017.webp" data-jdenticon-width="32" data-jdenticon-height="32" data-jdenticon-value="Captain Hypertext" onerror="onImageLoadingError(this);" />
    </a>
    <div class="s-user-card--info">
        <a href="../../users/4641017/captain-hypertext" class="s-user-card--link">Captain Hypertext</a>
        <ul class="s-user-card--awards">
            <li class="s-user-card--rep" title="reputation score">2,274</li>
            <li class="s-award-bling s-award-bling__gold" title="2 gold badges">2</li>
            <li class="s-award-bling s-award-bling__silver" title="25 silver badges">25</li>
            <li class="s-award-bling s-award-bling__bronze" title="32 bronze badges">32</li>
        </ul>
    </div>
</div>

</div>
        </div>
    </div>
</div>
                    </div>

</div>
        </div>

</div>
        </div>
        <script src="../../static/js/stack-icons.js"></script>
        <script>
            /* replace <time class="fromnow" /> with human delta between `datetime` attr and now */
            document.addEventListener('DOMContentLoaded', function(){
                var time_elements = document.querySelectorAll("time.fromnow");
                for (var i=0; i<time_elements.length; i++) {
                    time_elements[i].innerHTML = moment(time_elements[i].getAttribute("datetime")).fromNow();
                }
            });
        </script>
        
    </body>
</html>

Questions tagged [spam-prevention]

What is the best way to programmatically detect porn images?

Better Honeypot Implementation (Form Anti-Spam)

Hunting cheaters in a voting competition

Publicly Available Spam Filter Training Set

How to detect fake users ( crawlers ) and cURL

Detecting a (naughty or nice) URL or link in a text string

Spam Prevention/Reduction - Contact Form?