I think that people can be very rude of upsetting on Facebook. I unfriend anyone who says something mean of that could offend anyone else. I know I have friends on Facebook that I never talk to but if they don't do stupid things on Facebook then I'm not just going to unfriend them. Talking about selling things, I don't friend any companies. It's not like you will chat with them or anything. Adults are so much more strict on bad things so the percentages are probably a lot smaller for children and teens. It seems that people in my grade want quantity more than quality.