The answer to your question :
Cyber bullying is really bad. It makes everything seem dangerous. But it's not just that. There's a lot of other reasons to watch kids. There are hackers that they might not know about and inappropriate stuff like nudity and dirty jokes. Kids should be trusted, but what about when they cant.Parents should track their kids online. The people commenting no are the kids, one of them could be yours for all you know. What do these people have to hide. The people are saying no because they don't want their parents to see what they are doing
If they did not they would never know what their child is posting it could be rude things, not appropriate things, weird things, gross things, your child could even be a threat to other people so you should keep an eye on your child's posts to other people.