We used to have groups at my school (especially in 6th year, our senior year) The 'popular' people were the 'perfects' (prefects) who when in their own group wouldn't speak to anyone else who wasn't in the group. On their own though they would talk to others and were actually decent people. Yeah some of them annoyed me though. There was also the goths, the geeks and the normal people. Every group had their own place/tables/seats in the common room, it was kind of funny.