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Yesterday I visited the site. http://www.rottentomatoes.com

After a few clicks, If Opened My facebook account, me, will immediately become a member.

How it works? Document, the article I'm looking for this.. Thank you ..

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closed as not constructive by John Conde Feb 28 '13 at 12:36

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

I'm not really sure what's being asked here. Are you looking to implement Facebook OAUTH in a third-party website as a developer, or are you asking how Facebook OAUTH works from the perspective of an end user of third-party websites already implementing it? –  Noordung Feb 28 '13 at 11:49

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