I recently asked a question that was closed here.
https://stackoverflow.com/questions/3827349/how-to-use-one-openid-across-multiple-domains-closed
I didn’t even have time to correct myself. someone incorrectly interprets this, changes the name, someone else believes that he is not relavent and closed it .: (
A problem with the Google OpenID system. They are the protectors. And this is good. but when we use their OpenID system, they provide a DIFFERENT UNIVERSAL FUNCTIONAL IDENTIFICATION URL FOR THIS USER BUT FOR A DIFFERENT DOMAIN. that is, if I sign up for meta.stackoverflow.com using Google openID, and then I sign up for a site with Google OpenID, they will not have the same unique identifier. therefore, when two domains are merged, they cannot recognize one user through the domain. either they should use their email id or some additional information. I wanted to know if it is safe to use any other information with openID? I read that everything except a unique identifier (e.g. alias, email, dob, etc.) is not safe enough for openID,and we should not use it separately from casual use.
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