Article: A caution about Drupal as a social software platform

The open source package Drupal is one of the few social publishing platforms built on top of a longstanding Web CM (WCM) system. It has a strong foundation with a very flexible taxonomy system which -- along with thousands of 3rd-party modules -- enables you to assemble social publishing applications.

However, these modules could be your biggest problem as well because many times, module upgrades do not keep pace with Drupal upgrades. Even though Drupal has released version 6.2, many of the more popular modules are still on 5.x. These include Organic groups (for building communities or groups), MySite (module for MyPage or MyYahoo type functionality), Panels (module for creating more flexible layouts) and Views (module for creating flexible lists of content) -- all modules that are necessary for building such social publishing applications. Read more..

Courtesy : Cmswatch.com