We don't have a content filter (yet). I am super strict about what the kids are and are not allowed to do online.
My 11 year old is allowed to do internet searches provided she carefully thinks about the combination of words she types into the search. She knows to shut the lid and call for help if anything comes up she doesn't understand or is not supposed to see.
None of them are aloud to search youtube randomly. They can type in a specific search only and are not aloud to press any of the suggested videos that pop up after watching a movie without asking first.
My sensitive 8 year old is not aloud to search without me being present. I don't need to look over her shoulder but I need to be there for support if she happens across something distressing. She just needs the support.
At 6 no searches are aloud without parental supervision.
The oldest is aloud to chat to certain friends but not FaceTime. I allow chat because all their conversations also come through my phone for monitoring. Yes they all know that, even her friends. I can't monitor face time so I don't allow it. Some of her friends have already had issues with strangers on FaceTime so we won't be using it anytime soon.
Outside my home none of the kids can use any wifi, chat or internet or TV or computer games without consent .(except in school of course) yes they will call me from a birthday party to get the OK to watch a movie.
I may seem strict to some but I am happy with this arrangement and so are the kids. They all understand how these measures keep them safe. Especially as they get older and see the issues their friends are having with Facebook, FaceTime and Internet searches that go wrong.
I assume as I give them more freedom I will need a filter to help them remain safe. When they are ready emotionally and socially to have full rain I will give it. My oldest is probably ready now but since she is happy with me holding her hand through it I I will keep doing so for as long as I can