Because he typed it into the school computer without checking for questionably legal keyloggers? That doesn't give the school the right, only the opportunity, but these days that's not really much of a distinction.
You're only assuming this. Nowhere in Mr. Apple's previous posts did he explicitly say the person was using the school computers to log onto FB.
I also didn't say that i knew what he was doing with it at all. I only know that the school has it.
It's a fair assumption though, and in the absence of evidence to the contrary, that's what I'm pretty sure happened. Here's a list of other things that might have happened, and my reasons for thinking them unlikely:
1) He told them the password. Why on Earth would he do that? It's in violation on Facebook's TOS, and violating Facebook's TOS is a federal offense (or at least, Facebook thinks it is, judging by the way they're prosecuting people for "hacking" accounts).
2) Facebook told them the password. Does Facebook even store user's passwords anymore (instead of a one-way hash of same)? There's no technical reason to do so, and if they did it would be illegal for them to give out that information.
3) He logged on over the school network without HTTPS. Seriously? He never heard of Firesheep? Or did he think that only applies to wireless networks and that wired networks monitored by other people are magical?
4) His password was "password", or something equally stupid. Need I say more?
Actually, come to think of it, all of the above assume human intelligence not in evidence. Point conceded.