A Divergent goverment

So I saw the trailer for Divergent, and my friend has been nagging me to read it for a while. So I just finished the first book - pretty cool. Its a world split up into factions divided by personality (Honest, brave, nice, etc) I was thinking about it and that's a pretty cool idea. Although its a little bad, considering what happens in the book, it would probably be effective. Everyone would have friends with compatible interests and that would be handy. All in all, its a pretty intriguing system.