Friendica is open source software that implements a decentralized social network. It provides a wide range of connectors to other social networks. Connect with friends on App.net, Diaspora, GNU Social, Pump.io or Twitter. You can import RSS feeds and post to Facebook, Libertree, Wordpress, Tumblr, Google+ pages and more. You can even interact via mail.
Why Friendica? Simply, because we love freedom and want users to be in control of their social activity. Friendica is an alternative to walled-garden social networks that don't value user privacy.
To sign-up on a Friendica instance, visit the list of public nodes. Click the Name and then look for the "Sign-up" option.
Please report bugs or feature requests by using the GitHub Issue tracker. Pull Requests via GitHub are always welcome! It is recommended to subscribe to the Friendica support group, once you have a Friendica account.