Why friend would delete you from facebook?

[Arwen]

i understand that some people delete you if you are not good friend with them or you just lost contact, but i do not understand that friends with whom you attend classes together and you see them every day and you never argue with them delete you for no reason
i do not write or put anything on my facebook wall or anybody else, i am using it just to send message to my friends

[Joseph]

You may write things they don't like or send them request to games.
Or your just a C U N T and they don't really like you but pretended because they feel bad for you in some way.