Or do the opposite: scrape facebook to get all the names of people at the school and train an insult generator. Flood the site with random rumors about random people, but let everyone know that's what you're doing so no one knows what is authentic and what isn't.

The real rumors are lost in the noise, kids learn a lesson about trusting anonymous sources and the manipulation of mass opinion, and everyone realizes highschool brattiness is nonsense because you can literally auto-generate it.

Bonus if google makes this a summer-of-code project: eventually the app creators will force everyone to login with their google+ profiles.