Have you ever used Wordpress, Joomla or Drupal?

Simon

There're 3 famous CMS, wordpress, joomla and Drupal. And all of them can be extended to a SNS.

Anyone here who can tell us which is better, UCH and above mentioned three?

vot

All listed CMS have their own targets:
Wordpress is better for BLOGS.
Joomla is better for portal-like sites.
Drupal is not a CMS at all. It is a universal framework for everything.
Of course, Drupal is one of the world best frameworks!
But it is very complex, monsterous, and eat a lot of server resources.

So, if you want a small SNS itself - UCHome will be the best solution.