You're right that there needs to be more awareness about putting too much information about children on the Web. A child's picture should never have his/her full name, nor locating info, with it on a Web page.
Anne
BlogSafety.com co-director

Pre-Law, general obscenity law (online as well as offline) makes it illegal to download, possess, distribute, etc., nude or sexually explicit images of people under 18. If anyone runs across photos like that online it'd be good to capture the URLs and report them to the National Center for Missing & Exploited Children's CyberTipline.com (or at 800.843.5678). In Canada, the tipline is at Cybertip.ca, in the UK at CEOP. As for children posting explicit pictures of themselves, that's technically illegal too, but the law has barely caught up with that disturbing problem (usually kids have no idea these can get passed around, reposted, shared on the P2P networks, or otherwise illegally distributed). A really tough example involving a 13-year-old girl is here, and you can go to my article "Protecting teen reputations on Web 2.0" for the National Center's legal perspective on this growing problem that we feel parents need to know about. You can read more about the law where the social networks are concerned in NetFamilynews here. Hope that answers your question. All best,
Anne
BlogSafety.com co-director