You Are Aloud To Get On Facebook at School Now!

[Kotto*N[ix]mouth]

That is very odd for a school. I remember when I was in high-school, we had a great proxy hosted at the server that all traffic went through. Easy enough to bypass (with another proxy or a VPN, or even changing the poxy url from the server on the LAN to another one) but gave the average joe a run for their money.
I bet they change that soon, so I'd enjoy it while it lasts.