The Child Exploitation and Online Protection (CEOP) centre says nearly 90% of sexually explicit images are copied from their original location and re-uploaded elsewhere. A new film tries to warn teens in Scotland on the dangers of posting private photos:
http://local.stv.tv/glasgow/198156-teenagers-warned-of-dangers-of-sharing-personal-videos-online/
http://www.bbc.co.uk/news/uk-scotland-20174033
And a new Australian campaign to educate teens about online safety: