I hide most people that I'm friends with simply because they're not close friends and I really don't care enough to want to read about their lives on Facebook. Like I have a lot of old classmates and coworkers/excoworkers as friends that I talk to every now and then but don't care enough to look at their updates. I've only ever blocked one person on Facebook and that's only because they were being a douche and couldn't take a hint that I deleted them off my friend list for a reason.