Yeah this game is pretty cool, you will get addicted. =)

You can be in teams (or as we call it, parties) with a maximum of 6 people. But you can join alliances for a maximum of 18 people I think, or somewhere around there.

Just one suggestion, don't play this game flat-out. If you feel you need to take a break, then just leave the game and take a break, otherwise things get nasty. >.<;