You can use this gem when using authentication by facebook and digits.

Adds a /channel.html route to a Rails app. This fixes a IE7 problem with the Facebook JS SDK. See http://developers.facebook.com/docs/reference/javascript/ and http://stackoverflow.com/questions/2955012/facebook-javascript-sdk-fb-xd-fragment

Small gem for auth & getting info from facebook

simple facebook auth

Standard facebook-style messaging system. Not bound to any friendship structure. Integrates directly into your User model. Allows for users to comment on a thread, leave a thread, and be updated when a thread is commented on.

Facebook Video URL Converter is intended as an easy alternative to changing video hosting from Facebook to a different one.

Authorization that includes basic authorization and 3 social authorization with Latvia social network draugiem.lv, facebook.com and twitter.com.

An easy interface and abstraction to the Facebook Ads API

A Rails 3 gem for the latest facebook API

Devise << Facebook Connect.

Large collection of useful Rails 3.1 helpers for SEO, Metatags, Facebook OG tags, integration for analytics services like google, woopra, olark, mixpanel and much much more...

Paper-thin Facebook validation and signed request parsing Rails plugin

Models relationships between AR models. Allows you to follow, friend, and block other AR's. Consists of two mixins: acts_as_followable and acts_as_friend. These options allow an AR to inherit either a twitter-like follower system or a facebook-like friend system.

facebook_oauth is a Ruby client library for the Facebook OAuth Graph API

ReFacebook is a facebook library and Sinatra extension.

A mocking framework for the FB javascript library.

Embedify is a ruby gem that parses and returns an embeddable version of a page, similar to how Facebook fetches and retrieves page data when posting a link.

Facebook view helpers and signed request handling.

A limited command line interface to Facebook

A Ruby implementation of Facebook's yet-to-be-released GraphQL specification.