That probably depends on the field and the most impactful research rarely has any presence on either.

X might be a cesspit, but I would be more concerned about self-reinforcing "studies" being developed with and on Bluesky.

X algorithm is the most tunable I have come across.

I can mute all words I don't like to see, and hit a bunch of "Not Relevant"s once a month or so, and my X feed has only relevant content. And it has very high density.

I like the vibes of Fedi, but there is not enough density.

And Bluesky is just Old Twitter 2.0 without the density of technical stuff. That's the default feeling.

In this note, Facebook algo perform the worst. No matter how much signal I send to the algorithm by watching videos for longer, liking, commenting on stuff of my liking, hitting "Not interested" a lot, it still shows me the lowest commonly understandable dumb thing again and again.

YouTube algo is also very trainable and enjoyable.

X algorithm is the most tunable I have come across.

I can mute all words I don't like to see, and hit a bunch of "Not Relevant" once a month or so, and my X feed has only relevant content. And it has very high density.

I like the vibes of Fedi, but not enough density.

And Bluesky is just Old Twitter 2.0 without the density of technical stuff. That's the default feeling.