When I was a teenager and 2008 housing crisis happened I cared quite a lot about it. Sure it never affected me personally or anyone around us, but I spent a lot of time watching documentaries and reading articles around it and got upset and cynical about the world/regulatory authorities. It wasn't social media, but ease to pirate movies and looking for documentaries recommendations online that led me to it.
This notion that "it doesn't directly affect teens so they don't care" is a painfully naive narrative. If anything teens have A LOT of time and energy and little clue what to do with it. So many naturally find something to care/obsess over, with or without social media. (although it is probably amplified by it)