Reminding myself that if someone says something dumb and I'm mad about it the most productive thing to do about it is block them and the least productive thing to do is write a post that they won't see about it
I get the sense that people who did or still do use Tumblr (as in, that social sphere which I have had little overlap with until joining Cohost) mostly do think that, for lack of a more nuanced word, "activism posting" is good and helpful. Like, you see comments espousing some bullshit and think either "If someone sees this comment going unchallenged they will think that's normal and possibly correct, I must be the visible opposition" or "There's probably tons of folks thinking this or on the fence, if I make a post about it it will help sway or shame them based on how popular it is".
But specifically when it's done in response to some bullshit you saw online, I think it's mostly just venting. You get stuck in this spot where you want to be harsh to punish them, but you don't want people to see you being mean, so you want to make a serious call out that explains why this is bullshit, but if you reply directly it would seem petty and they might just troll you more, so you take your big argument and vaguepost it and mention "I've seen lots of posts that say" or "Thinking about how people say that" as a kind of handwave towards the bullshit that set you off. The likes and reshares that follow are validation that you were right about that bullshit.
But it's stressful to do that and it's stressful for folks to see you bring up unknown bullshit because everyone is making up their own worst example in their head of what the specific bullshit was, getting mad about that, and then cheering you on to validate their own frustration.
I'm distinguishing between venting disguised as activism posting and genuine, intentional posts taking on a difficult or controversial topic or trying to educate folks on something. The latter are obviously important and helpful. But the volume of the former is so much higher that it burns people out emotionally and they don't have the headspace for chewing on more intentional posts.
So I try to avoid that kind of venting when I can and to give less time to posts when I can tell they're a vent in disguise.