Let me throw my group into the mix. We are The Dark Knights. We're fun, active in the forums, and about to start our 1st vote chess game vs another group:
http://www.chess.com/groups/home/the-dark-knights
Another group I'm very active in, if you like college football (we've got a modified NCAA/NFL Fantasy Football League going on) is the College Football Group:
http://www.chess.com/groups/home/college-football
If you're the type of player who never likes to resign, and will play to the end no matter what, The Chess Spartans are looking for more members (I LOVE their group avatar!!):
http://www.chess.com/groups/home/chess-spartans
Rael's group for Poets and Writers of Chess.com will give you all kinds of interesting things to read:
http://www.chess.com/groups/home/poets-and-writers-of-chesscom
And if you're into talking about things that most people shy away from talking about, there's The Open Discussion Group:
http://www.chess.com/groups/home/open-discussion
There are also groups based on what country or state you're from, which sport or sports team you like best or are simply a fan of, movies, TV shows, music, cartoons, other web sites even (saw 2 different groups for Club Penguin users), you name it. If you like it, someone else does too. If there's not already a group for whatever you like, make one. If you build it, they will come. 
Pimpingpawnage wrote:
mercytononeZ wrote:
artfizz wrote:
The Dream Team has the most members. Groups such as blue Magic
have NO members - so arguably there would be less dissent there.
the dream team, in my opinion, is stupid and chess.com fans because they have no purpose and are very unactive
I totally agree, dream team is a really snobby group, and being a member of chess.com is like being the teacher's pet,
The "Amateur Chess" group however, is the best group that ever did exist....ever, better than the beatles and Jesus
btw..That's Amateur chess the 3rd most popular group on the site, check it out