The ability to make connections, track the activity of others and focus on people which care the most
Private Messaging allow your users to talk to each other directly and in private.
Global, personal, and group activity streams with threaded commenting, direct posting, favoriting and @mentions, all with full RSS feed and email notification support.
Groups allow your users to organize themselves into specific public, private or hidden sections with separate activity streams and member listings.
Full-powered discussion forums built directly into groups allow for more conventional in-depth conversations.
Extended profiles with fully editable profile fields
The ability to modify their account and notification settings directly from within their profiles
The ability to add posts to the blog and write comments