Absolutely. The list of categories sounds like the list of categories popular filtering software provides. I was behind a transparent proxy that applied these rules at a former employer, and yes, HN and Reddit were both blocked.
Of course, they only blocked news.ycombinator.com and not news.ycombinator.net, which just goes to show you how useless these filters are for protecting children and how useful they are for "accidentally" blocking political oponents for a couple days.
Of course, they only blocked news.ycombinator.com and not news.ycombinator.net, which just goes to show you how useless these filters are for protecting children and how useful they are for "accidentally" blocking political oponents for a couple days.