In Holland providers stopped working on a 'childporn' filter they announced today. They found out that there is less and less childporn on the open internet. Blocking won't help, removing it is better. Also childporn goes more and more underground and is spread in social networks instead of websites.
So the best thing to do is close facebook and other social communities.
http://www.emerce.nl/nieuws/internet...st-kinderporno