Rails 3 facebook plugin/gem?

Does anyone know of a good Rails 3 compatible gem or plugin that support the Facebook API (rather Graph API but old REST is ok too)? Mostly for getting profile picture, info, friends and posting on wal开发者_StackOverflow中文版l. I am looking for something that seems to be maintained well so I know I can count on it in the future as well.

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Koala :- A lightweight, flexible library for Facebook with support for OAuth authentication, the Graph and REST API's, real time updates, and test users.

https://github.com/arsduo/koala

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OAuth2

http://intridea.com/2010/4/22/oauth2-gem-just-in-time-for-facebook-graph

http://github.com/intridea/oauth2

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I found Mini_fb as quite good one. Try it.

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Well written, well maintained (as at time of posting) https://github.com/nov/fb_graph