You've probably seen the video warning people not to share their photos online, but it's actually OK to do that as long as you make some adjustments on your phone.
On an iPhone: go to General - Privacy - Location Services - Facebook (off).
On an Android: Tap Camera - Settings - GPS Tag (off).
What about sharing a photo you've already taken? No problem - just take a screen shot of the photo and share that. Be safe this school season!