The Facebook-style Statuses module allows posting messages to "streams"
attached to various entities, just like Facebook's "walls."

Extensive admin documentation is available at http://drupal.org/node/1135246
Thorough API/developer documentation is at http://drupal.org/node/1161064
Visit the project page at http://drupal.org/project/facebook_status
Check out the issue queue at http://drupal.org/project/issues/facebook_status

Isaac Sukin (IceCreamYou) wrote and maintains this module.
Contact him at http://drupal.org/user/201425/contact
or visit his website at http://www.isaacsukin.com/blog.