1.Yahoo! Groups
Yahoo! Groups allows you to create and manage online email communities in areas such as Recreation and Sports, Entertainment and Arts, Hobbies and Crafts, ...
-- http://groups.yahoo.com/
2.Google Groups
Google Groups allows users to start their own email discussion groups and message boards, and browse archives of Usenet groups.
-- http://groups.google.com/
3.Flickr: Groups
Flickr is almost certainly the best online photo management and sharing ... Group Guidelines Browse all Groups. Groups are a fabulous way to share photos and ...
-- http://www.flickr.com/groups/
8.ICQ Groups - ICQ.com
Support Groups. Grief. Disorders. Disabled. Reducing. weight. Family Matters ... ICQ groups allow you to connect with others that share your interests.
-- http://groups.icq.com/
9.Groups - Windows Live
The shared calendar makes it easy to see who's busy when, and plan your next group event. ... discussions, send e-mail, or IM with the whole group at once.
-- http://groups.live.com/
11.Wikipedia: Group
A group is a number of things or persons being in some relation to one another. ... Group action, a way of describing the symmetries of objects using groups ...
-- http://en.wikipedia.org/wiki/Group