I don't use Facebook, but I read an article about how it takes people back to the mental state of high school. People are so concerned about how many friends they have, compare them to others, how many comments and hits they get.

What your describing doesn't happen much in the real world, if someone doesn't want to talk to you they will just ignore you, they wouldn't say to you I don't want to be your friend anymore without explaining why, but in the world of high school it happened a fair bit. If the environment is like high school, people begin to behave like it.