For my Facebook API projects, I use the following Graph API - https://github.com/moomerman/facebook_oauth
They have a great example of an application hosted on - http://facebook-oauth.heroku.com/
The gems of the gem itself are very useful.
If you are looking for a third-party perspective when using the library, then I am not sure that you will find it, since the WIKI of the gem itself is quite explanatory and useful.
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