Can my school really do this shyt? (Funny/retarded story)?

[Danica]

So recently A LOT of kids at my school have been getting sent into the office about the thing they have been posting on their social networking sites- such as:(twitter, facebook, instagram, tumblr, and ect). And everything that they were calling us in for was nothing like cyberbullying, it was us just saying the 'f'' word. So smartass me decides to post this on facebook, and I was wondering if I can get in any kind of trouble for this. I'm not scared or anything I just want to know cause I think its down right hilarious that they are really getting worked up over this.

i really think that the stillwater junior high principals are dumb as fuck. yeah i said it, fuck. cause' y'know this is my facebook, and i can literally post whatever the fuck i want too, ANYBODY can. and we are very well aware of that too! so the next time you call one of us fucking kids into your fucking office, we'll just post another one of these for ya'! thanks for making our year a fucking blast!

Yeah, you see what I did there? Dropping the 'F-bomb left and right.. soo witty, i crack myself up! But yeah I want to know if its even like i don't know legal, right to get us into trouble because of that. Like I'm in 9th grade so I'm just now getting into the constitution and i found this in my book; In the 1st amendment of OUR NATION'S CONSTITUTION, it is stated we have the right to free speech. In the 1965 courtcase Tinker V. Des Moines it was ruled that students leave their 1st amendment rights outside of school grounds. Meaning that when they walk onto school property they no longer have the rights of the 1st amendment. But I just want your guys input on this!
Thanks XD