I admin many Facebook pages each with over 20000 likes, worked in the alter since I was 6, writes for a comic book website and enrolled in an engineering program for HS at UCLA.
I’m not sure if being an admin for a Facebook group really matters, unless you you’ve raised money/significant awareness using it. Working at the alter is a great thing, especially for religious colleges and writing for a comic book website is a great extracurricular that’s very unique. The engineering program is also great too. However, you might want to consider joining or creating a club (maybe a comic book club?) so you can eventually have some leadership.
Try turning the facebook pages into a cool research project- you have a lot of data at your finger tips, and it would certainly make an interesting essay 