Authlogic OAuth2 is an extension of the Authlogic library to add OAuth2 support. OAuth2 can be used to allow users to login with their Facebook credentials.

A library for supporting implementation of Facebook Messenger Bots.

Interacts with Facebook's Graph API.

Facebook Dialog Url Duilder

A library for building Facebook Messenger bots.

nanoc extension that adds useful helpers (facebook, google analytics, etc).

Automatically replace mentions, hashtags, urls and emails with links for multiple services (twitter, instagram, facebook, ...)

A Rails 3 gem for the latest facebook API

Painless user registration and sign-in using Facebook single sign-on with JS. Typical email login still works too. (Gem no longer maintained)

This gem is used to mock the communication part of the facebook graph api.

TinderAuthFetcher enables you to retrieve a Facebook authentication token, which is necessary to use Tinder API

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.

Converts from Ruby's locale to the nearest Facebook's locale. This way you can localize the "I like it" button on every web page you want

It read file containing list of urls and produces output file with domain, page title, twitter, facebook and google plus handles found on the page

check out the facebook page for more

rails-social-share-button is one of the best rails helper gem​ to add social share feature in your Rails app. Such as Twitter, Facebook, Tumblr, Weibo, Douban, QQ...

Take a offline copy of a facebook fan page.

This gem will mock the oauth of facebook using facemock.

Includes authentication, tracking, and lots of convenience methods

Simply keep your OpenGraph-Objects up to date