The use cases of automatically adding your friends pictures and birthdays to matching phone contacts was awesome when I first used it in college. Games like Words with Friends are a lot more fun when I'm actually playing with people I know. Not everyone discovers and plays games at the same time so its nice seeing when someone new starts playing and also knowing not to pester friends that stopped playing long ago.
Being connected with actual people I know is nice, I just hope it doesn't all have to go away because there are so many people out there trying to abuse the data.