I graduated three years ago, but we had this problem for my entire time in highschool. They even had Wikipedia blocked for a while, presumably because they didn't want students doing their research there. Of course, the interesting thing wasn't so much what they did block as what they didn't; I remember trying to get to some community run forums for a game I used to play, and finding they were blocked, then going to the official website for this very much M-rated game, and finding it wasn't blocked. As far as I know, they never blocked it.
That wasn't the only discrepancy in what was blocked, or even the biggest; another minor one is that youtube was blocked, but not Yahoo video. The big one, though? Despite the fact that the main purpose of the filter was to keep kids from finding inappropriate material, especially porn, people were still able to find porn through a simple google search. The moral of the story: these filters don't work, and they're kind of creepy, being government censorship.
That wasn't the only discrepancy in what was blocked, or even the biggest; another minor one is that youtube was blocked, but not Yahoo video. The big one, though? Despite the fact that the main purpose of the filter was to keep kids from finding inappropriate material, especially porn, people were still able to find porn through a simple google search. The moral of the story: these filters don't work, and they're kind of creepy, being government censorship.