Facebook - Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.
Waver - Description: Google Wave is a great way to communicate and collaborate. Waver lets you:
X (Twitter) - Connect with your friends and other fascinating people. Get in-the-moment updates on the things that interest you. And watch events unfold, in real time, from every angle.
Rizzoma - Email and IM are linear contextless communication tools.
Mastodon - Mastodon is a decentralized, open source social network. This is just one part of the network, run by the main developers of the project It is not focused on any particular niche interest - everyone is welcome!
BSI Knowledge Manager - Central document management & knowledge base