
You can do so much with Drupal.
I love Drupal :)
Drupal, CMS, Opensource, Chennai
Enable users to create and manage their own 'groups'. Each group can have subscribers, and maintains a group home page where subscribers communicate amongst themselves. They do so by posting the usual node types: blog, story, page, etc. A block is shown on the group home page which facilitates these posts. The block also provides summary information about the group.
Multi-site is a very powerful feature in large sites or hosting operations but is often mis-understood. Multi-site is designed as a way to share the same code base for multiple different Drupal based sites. These sites are separate and do not share content or administration. Multi-site just helps with managing the code base, shared themes and modules.
A single Drupal installation can host several Drupal-powered sites, each with its own individual configuration.
The concept of OG is good for inter-related sites, when there are a lot of common functionalities across these sites.The decision of Multisite vs OG has to be based on the no of multisites that need to be created and the functionlaities across these sites.