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...

Social Stream is a Ruby on Rails engine for building social network websites. It supports contacts, posts, file uploads, private messages and many more.

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

This is social networks api wrapper and authorization tools for social applications. Now it is a compilation of code from various projects in production. Without tests. =( NOT RECOMMENDED USE IN PRODUCTION.

Based on font-awesome, rails-social-colors provide official colors of social brand icons

This gem allow you to connect several social stream nodes using PSHB hubs, also allows to follow, and share streams with social stream users in any node.

acts_as_social is a gem that provides basic social features, like view and controller helpers and models

Social Stream is a Ruby on Rails engine providing your application with social networking features and activity streams. This gem supplies with OAuth2 server support

Easily create sharing links for all of the major social networks using a simple link_to_social tag.

Add social network friendship features to your Active Record models.

Easy way to retrieve Google Page Rank, Alexa Rank, backlink counts, index counts and different types of social signals

bootstrap-social for Rails asset pipeline

This gem helps to add various social widgets that are commonly used by rails applications. Supports Facebook, Pinterest, Twitter, Flickr, LinkedIn and Google+.

Easy social network integration for Jekyll sites

RubyMotion Wrapper around the Social Framework

Add social media icons to your Rails 3 using CSS sprites or images

Jekyll plugin to render your social networks icons

Zocial Buttons support a lot of social icons. This gem is used for seamless integration of those icons.

A suite of apps and tools for participating in the social web.

Ruby client for LINE Social API