How to: Social Networking
* [Decidim](https://github.com/decidim/decidim) - free open-source participatory democracy for cities and organizations
* [diaspora*](https://github.com/diaspora/diaspora) - A privacy aware, distributed, open source social network.
* [Discourse](https://github.com/discourse/discourse) - A platform for community discussion. Free, open, simple.
* [Mailboxer](https://github.com/mailboxer/mailboxer) - A private message system for Rails applications.
* [Mastodon](https://github.com/Gargron/mastodon) - A GNU Social-compatible microblogging server.
* [Retrospring](https://github.com/Retrospring/retrospring) - A social network following the Q/A (question and answer) principle.
* [Social Shares](https://github.com/Timrael/social_shares) - A gem to check how many times url was shared in social networks.
* [Thredded](https://github.com/thredded/thredded) - Rails 4.2+ forums/messageboards engine. Its goal is to be as simple and feature rich as possible.