I agree - at first the idea was great and if its use the right way, it can be a great way to keep connected to family/friends that are far away. All to often though its a place of judgement and extreme fighting. There's a boy at my daughters school who bullies online and here's the typical things he'll say -
"blank is a failed abortion.....blank is raped by his/her parents......you can suck my ----".....put a bag over your head so I don't have to look at your face while I look at your b----". There's so much online bullying that happens. Encourage your daughter to have good privacy settings and block people who are mean. Don't have any pics even if they're a bathing suit because a person across the world can copy the pic and put it anywhere.