I'd suggest Facebook-Connect integration in the new release .

With facebook connect , one can connect his account to Facebook account.
And when he makes a post , all his facebook friends will be notified .

This will be a great way to promote his post (and site flow).

API : (in PHP)
http://developers.facebook.com/connect.php
http://wiki.developers.facebook.com/index.php/Connect/Authentication_and_Authorization
http://www.goldsteintech.com/facebook_connect/tutorial.php

English is not my native language. I try my best to express my thought precisely. I hope you understand what I mean. If any misunderstanding results from culture gaps, I apologize first.