Piccaya

With StatusNet you can encourage collaboration, build and engage your community, and be in command of your brand.

Features

Updates using a XMPP/Jabber/Google Talk client.
OpenID authentication.
Supports Federation
SMS updates and notifications.
A Twitter-compatible API.
Hashtags.
Multilingual interface (using Gettext)
Cross-posting to Twitter
Facebook integration.
Groups (Bangtags).
Automatic URL-shortening.
Geolocations and maps.
Live update of stream.
Attachments (add files, images, video, audio to dents).
Embedding of content from other sites, like YouTube, Flickr, etc.
Implementation of Salmon Protocol
Upcoming priority features:[12]
More Ajax-y interface
Cross-posting to Jaiku, Plurk, etc.
Pull messages from Twitter, Plurk, Jaiku, etc.

How to install Status Net