Internet filters are often seen as an effective way to protect children from the dangers of the Internet. But how effective are they? And, from questioning young people being unable to access gender identity and sexuality -related resources, to potential data protection issues in schools, they can have a lot of negative consequences too. In the wake of the Kiddle fiasco, we'll look at the pros and cons of Internet filtering, with particular focus on the problems they can cause that might not be immediately obvious.