What is Friendica and why should I bother using it?
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.
