Imo the problem is that social media is one of the worst possible places to foment political change, yet is by far the most popular.
If people actually have a shit about this stuff, they’d be out campaigning for it, or helping people affected by it, instead of just clicking a button and patting themselves on the back.
Not to say social media can’t bring change of course, but I mean, the people posting the most are pretty much by definition doing the least.