It makes sense to me that they would do it at the school level.
The pressure to use social media and etc will come from those around them. Being the one student not on social media would have it's own pressures I imagine.
I'm in my 30s, but still remember being the only Senior in highschool without a cell phone. It made it really hard to meet up with people, go to parties... really do anything. Social media was really just starting though and was something people maybe spent 1/2 hour on at night. The iphone had just came out, so no Instagram and apps like Snapchat. I can't imagine going through that hellscape now.
The pressure to use social media and etc will come from those around them. Being the one student not on social media would have it's own pressures I imagine.