I am currently setting up my mvc 4 web application with the out of the box membership functionality included in .net.
I would like to expand this functionality to support open id providers such as facebook, twitter, my open id, dotnetopenid etc etc.
Once a user logs in with such, they have the ability to update their profile, name etc and get saved in to database same as if I had created a account with a password.
Question is I am not sure what modifications are require to support open id in the database. What information is needed to be stored to support open id? Are there any examples available of a data structure that supports both password login and open id login?