The 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/statuses
Check out the issue queue at http://drupal.org/project/issues/statuses

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.

Mathankumar Chermakani (mathankumarc) also maintains this module.
Contact him at http://drupal.org/user/1315174/contact
or visit his website at http://mathankumar.drupalgardens.com/.