I dont get the purpose of these. I mean.. Its like their made so you can go to porn sites, and not get pop ups, or to use at school, at not get caught. There is not legit reason for them. Hahaha
What my school blocker dose is scan the page for "banned" words, it also has a list of blocked sites, and an IP filter and dosnt allow you to go to sites hosted in certain countries .... the over all result is slowing down the connection