1. "social media" is toxic
They may consume video on YouTube etc but the thought is, even amongst smart kids, that there is no net positive to interacting with people you don't know on social media.
This is somewhat disheartening given how many wonderful people I've met by just "being myself" on Twitter.
2. There is no central social media network anymore
I coached college club sports from the mid-2000s to the early 2010s. It's hard to overstate how EVERYONE in college was on Facebook. We used to have a dedicated forum for one of the teams and the president convinced me to go to Facebook groups b/c:
"Everyone is already on it and it has a notification system that people check b/c it's how they find out about college parties"
A current club president didn't even know what would be the best way to reach students other than flyers and setting up a table at the student center.
(I suggested Reddit and he acknowledged that would probably be one place where you at least knew students from the school might be there and were interested.)