Ruby on Rails is an open source web application framework for the Ruby programming language. It is intended to be Used with an Agile development methodology That Is Used by Web developers for rapid development.
There are lots of Websites That use it including popular ones like Twitter, github, Scribd and many more. If you are planning to build a social networking site using ruby on rails. You should to consider most popular social networking platform below, which was built using ruby on rails.

Diaspora

Diaspora is an open source social networking application in Ruby on Rails. It includes most of the features to be expected like friendships, status messages, photos, etc. Diaspora aims to be a distributed network, where totally separate computers connect to each other directly, will let us connect without surrendering our privacy.They call these computers ‘seeds’. A seed is owned by you, hosted by you, or on a rented server. Once it has been set up, the seed will aggregate all of your information: your facebook profile, tweets, anything.

Diapora considered to be a Facebook alternative by many sources. Today, Diaspora, a potential rival for Facebook, released its open source code, inviting designers and programmers to help shape the network. But his unique, one of the people who contributed to fund the development of diaspora is the CEO of Facebook, Mark Zuckerberg.

Insoshi

Insoshi is a social networking platform in Ruby on Rails. You can use Insoshi to make custom social networks; see the Insoshi demo site for an example. Features include activity feeds, profiles, photo sharing, comment walls, blogs, forums, user messaging, and an admin panel.It’s on GitHub, so you can fork it to your heart’s content, and it can act as a base for developing your own social Web application.

Insoshi was originally developed by Michael Hartl and Long Nguyen as part of the Y Combinator program, and is presently maintained by Evan Dorn and Logical Reality Design.

CommunityEngine

CommunityEngine is a free, open-source social network plugin for Ruby on Rails applications. Community Engine is a plugin that can add social networking features to existing Rails applications. Drop it into your new or existing application, and you’ll instantly have all the features of a basic community site.

Features

• user profiles, blogs
• private messaging
• forums
• events
• plugin
• photo uploading
• clippings, static pages
• commenting
• friendship
• activity feeds and localization.

LovdbyLess

LovdbyLess is a free and fully customizable social networking platform, built using Ruby on Rails. Built with Ruby On Rails, LovdByLess is feature rich and allows for social interaction on every level.It comes with many of the same features and functionalities of its loved-by-more counterparts, Myspace and Facebook.

Features

• blogs with comment capabilities
• photo galleries with captions
• profile bio and information
• the ability to follow a user or “friend” them
• site search for friends
• user-to-user messaging
• profile comments
• user dashboard (recent activity feed)
• emailed activity
• flickr integration
• youtube integration

Lovd By Less has the edge by being MIT-licensed, making it easier to use in your own commercial applications.

EngineY

EngineY is a social network and CMS framework implemented in Ruby on Rails that is easy to customize and deploy as your own powerful and feature packed social media or CMS site. Empower users with their own blogs. Enhance collaboration with forums, groups and events. Let your users post Twitter-like status messages. Track all the activity on your site with a live activity stream.

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