Everything imaginable is banned in my old high school.(Just graduated).
I'm one of many that led to the banning of flash drives. Apparently, they're so scared they'll get hacked that .bat, or batch files, are automatically red-flagged. I ended up in ISS for 3 days because I play an N64 emulator in a class where we did NOTHING. The computer guy still had no idea what I was doing or why I used a batch file even after the guy had my flash drive and I explained it to him, but my words fell on deaf ears.
As for PBNation, I managed to read it sophomore year, along with the World of Lamecraft forums and many others.