Facebook doesn't make you kind

Facebook has preserved, restored, and even founded many friendships, but while it may make people more sociable, it certainly does not make them kinder. If anything, it makes people less kind, because they are able to write whatever they want without the threat of face to face confrontation, and also when you're just exchanging messages with someone, and not looking at them or hearing their voice, it's very easy to forget who you're talking to and not censor yourself accordingly.
I have some personal experience with this. After seeing pictures of a neighbor's girlfriend, I sent a private message to my cousin saying that she was rather unattractive. My cousin then responded on my wall, where my neighbor saw it and took offense, which then made me feel pretty awful. If Facebook had not been involved, the whole situation could have easily been avoided. Not so much because I probably never would have seen my neighbor's girlfriend, but because if I had been having an actual conversation with my cousin, I wouldn't have remarked on her looks, knowing that my cousin likes to talk trash as much as she does.