See http://developers.facebook.com/docs/authentication/canvas

This gem acts as a proxy for avatars on Twitter & Facebook.

Easy helper methods for adding custom social share buttons (Facebook, Twitter, Google+) to your Rails app.

Social linker generates share-links for the different social networks from a simple SocialLinker::Subject class. Supported networks are: Twitter, Facebook, LinkedIn, Google+, Pinterest, and email

Want to know how popular you are? This gem helps you look up how many Facebook friends and Twitter followers you have.

StatsCollect is a little framework gathering statistics from external sources (social networks, web sites...), stored in pluggable backends. It can be very easily extended thanks to its plugins (currently include Facebook, Myspace, Youtube, Google).

It finds, caches and updates social engagement of urls on social media (facebook, twitter)

Telangana -- Telangana News,Facebook updates,twitter updates

Streetcred helps to handle the credit callback needed to use Facebook credit.

Easy event logger plugin for Rails 2.1. (Think: Facebook's recent activity feed.)

A RubyMotion Facebook Wrapper, based of @clayallsopp's TwitterMotion wrapper.

This gem allows to easily access facebook's ads api in ruby. See https://developers.facebook.com/docs/reference/ads-api/

Supports Facebook, Pinterest, Reddit (Links, Posts, and Comments), Github, Soundcloud, Medium, and Rubygems

Cross allows you to cross post to twitter and facebook from command line.

Create login with devise, omniauth and facebook

This is app for build

Gem that allows to get feed from both rss and facebook page

OpenGraph provides an easy to use wrapper for making facebook calls. It also provides javascript stubs allowing seemless testing against the javascript sdk.

FFI bindings for Facebook's FastText text classification library

Fork of clearance, not-purely-restful, but with Facebook goodness