There are teams for everyone... u can choose to be on the team of ur preferito character =)
These 3 are supposed to be the main ones:
Team Edward Team Jacob Team switzerland
But here are some of the others (for the rest of the Characters):
Team Charlie Team Renee Team Mike Team Eric Team Angela Team Jessica Team Bella Team Alice Team Jasper Team Emmet Team Rosalie Team Carlisle Team Esme Team Sam Team Seth Team Embry Team Laurent Team Victoria Team James Team Jane Team Aro Team Marcus Team Caius Team Alec Team Felix Team Demetri Team Gianna Team Quil Team Paul Team Leah Team Newborns
Team Edward Team Jacob Team Switezerland Team Jalice (Jasper & Alice) Team Emile (Emmett & Rosalie) Team Cesme (Carlisle & Esme)
The main three (team Edward, team Jacob, team Switzerland) are just expressing who te think Bella should end up with o which of the main 2 guys te prefer. Team Switzerland means te don't have a preference between the two.
Other character teams, like team Jasper o Emmett o Carlisle, is just saying te prefer that character over both Edward and Jacob. It can also be saying that you're not that interested in the main pairing.
Then te have the sarcastic teams, like "team Tyler's van" o "team Buffy stakes Edward". These are just used da anti-Twilight fans.