Friendica is a free open source social network, and part of the ActivityPub Fediverse. It has a Facebook-style interface, and also lets you follow RSS feeds as if they are users. The official blog is at:
The official site is at https://friendi.ca
Source code is at https://github.com/friendica/friendica
It can be used through the web interface, or the Fedilab app (https://fedilab.app).
This is a brand new server run by the main developers of the project as a spin-off of mastodon.social It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!