[blfr]

For better or worse (ok, worse), Twitter is the current intellectual trend-setter. You may not be there but many a youtuber/podcaster/academic/politician are scrolling through hot takes as we speak. The cultural power of Twitter vastly outweighs its raw number of users (relatively low).

[jltsiren]

I'm not sure Twitter is that relevant anymore, as you can't really browse it without logging in. It's more like an echo chamber for influencers now than a platform interesting people could use to reach their audiences directly.

I used to be active in a corner of the science Twitter, but it started dying long before the takeover. Algorithmic recommendations killed it. When a platform starts prioritizing recommendations over explicit user choices, it also prioritizes influencers over people with something interesting to say.