Any (twitter-like) microblog CMS under GNU license?

CMS & WordPress
1

Could anyone recommend any Open Source CMS for microbloging platform?

It is preferable twitter-like, or any other popular microblogging sites.

Thanks in advance

2

I second status.net - it’s what they use over at identi.ca

3
4

A few months ago I came across a Wordpress-Twitter adaptation, I’m sure Google helps you to find out more about this.

Drupal can certainly be turned into a Twitter-like application, though it’ll take some development time.