It's like the infinite monkey theorem, but faster. Give a bunch of tweens long enough and they'll find their way around any internet filter.

This is how it worked for us. Parents did what they could to block PC access, but me and my brother managed to break them all to do what kids do online. At certain point, you have to actually talk with your kids even if it is the kind of 'smoke that cigar until you are sick' approach. Naturally, my dad being my dad, took a different tack. He just picked the PC and took it to his shop.

Different times. Needless to say, I don't think I will be able to try the same approach.

Yes, great, this is in line with my point. I'm not saying you should take control of the internet but you are responsible for how they interact with it.