I suspect that Facebook and Twitter have their own linear algebra models of who is interested in what, and that factors into their choices of what content from your friends makes it into your stream.
After the wave of MeToo posts on Facebook and Twitter had died down, I asked my friends on Facebook to characterize how many MeToo posts they'd seen. Liberals reported seeing far more MeToo posts than conservatives did.
Something I didn't ask about, but have seen after the fact, is that conservatives and liberals seem to have a totally different idea of what MeToo is about. Algorithmic balkanization may have contributed to these differing ideas, and cordoned most of the MeToo-related activity in a liberal cluster of the social graph.
I saw a lot of personal stories of harassment and abuse from my friends. The sheer volume of them was undeniable. I could never say, given the experiences my friends reported, that it was mostly symbolic. Those experiences were very much concrete. It is possible that my particular subset of the social graph is disproportionately affected by sexual harassment and assault, which would affect the validity of any conclusions about the broader society I might draw from what I saw. But, for the subset of the social graph I observed, there is simply no way to call it symbolic.