I want to know how does SO registers users if they have only a gmail account and don't ask for any information.
in a word, how it is possible to login with google or facebook account in another website using openID.
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Alireza Fallah
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I'm not really sure what you're trying to ask; are you looking at something like [this](http://stackoverflow.com/q/4874186/899126)? – Chris Forrence Oct 08 '13 at 14:05
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Voting to close own question when a dup is found: +1 `:)`. – halfer Oct 08 '13 at 14:21
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Stack Overflow allows you to register using your Google account, meaning as long as you're logged in via Google at the time you register/log in you won't need to supply a username/password. Stack Overflow will then get some needed information from your Google account after you authorize it to.
Here's a decent run-down of the process: http://qpleple.com/how-to-make-people-login-into-your-website-with-their-google-account/
And some SO questions that are similar:
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John Dorean
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