I've seen some relatives' kids accounts on Facebook. I'm not sure I can be as optimistic as your last paragraph. If anything, I'm pessimistic that many kids are writing utter utter trollish garbage online that may never ever go away.

Of course, there will be kids that are smart and don't do this, but kids that want to 'fit in' or 'be popular' may well end up rolling with the crowd and posting things that will hurt them later on.

As parents, we should be looking out for our kids, both in real life, and online.