Time to stick it up:

School districts in Illinois are telling parents that a new law may require school officials to demand the social media passwords of students if they are suspected in cyberbullying cases or are otherwise suspected of breaking school rules.

Good luck assholes -- here would be my answer were I the parent of such a kid:

If the school believes they have an enforceable demand for same they can go get a warrant and serve it on the provider (e.g. Facebook) in question.  Neither I or my kid need give them anything; they can get whatever they want via proper judicial process.

Until that time?

Any questions?

Ps: To all you school admins - I suggest reading 42 USC 1983. You have a very nice house and I'd like to make it a trashy rental.