In the light of this post on the more unsavory uses of Flickr (there is a long comment thread) it is worth taking note of this study, highlighted by David Weinberger, that shows that the internet just isn't the danger to children it is often portrayed to be. Weinberger comments, "This is an important report because it is relentlessly based on data-driven research. The task force believes it has considered every piece of peer-reviewed research published and more. Its conclusions come in response to all the known data." If you want to be worried about something, be worried about child-to-child bullying (and the sort of things in our society that would lead a child to thing that this sort of behaviour is appropriate).