how to create a feature to "find people via gmail , facebook" to my website [closed]

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I'm developing a website that is a social network where people can add their friends to it and interact with them, I want to help them find their friends via Gmail or Fac开发者_如何学Goebook to make it easier for them.

Please help me with where can I find instructions to get it done.

thanks. (I'm not a very experienced developer so if you need me to supply more info just let me know)

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Facebook: http://developers.facebook.com/docs/reference/api/

Gmail: http://code.google.com/apis/contacts/