RPXNow user mapping

Posted by chelfers on Stack Overflow See other posts from Stack Overflow or by chelfers
Published on 2010-03-18T01:03:26Z Indexed on 2010/03/18 1:11 UTC
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I am looking into solutions for providing multiple login methods to my site. I found rpxnow.com and they map user accounts from all the different networks. My question is how do they know that I am user1 on twitter and bigdude2 on facebook? I'm hoping it goes beyond email lookups.

The end result I want is a unique user in my database no matter what account they sign in with, dupes are a no-no, but most likely inevitable I am guessing.

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