My guess would be this is one of the few major bots that ramp up its posting during Prime Times. I've been trying to use the fediversee for almost a year now and I check post multiple times a day, everyday. The vast, and I mean upwards of 90% or more of the post in my feed are just repost bots from Reddit or news aggregator bots. I'd be surprised if more than 10% of the post generated come from actual humans. I'm sure some of the server owners could give us much more insight on this with post by IP statistics. But my guest regardless is human interaction is pretty low.
Turn off bots in your profile and then ban the two or three bots that aren’t marked as bots and your feed will improve immensely. I forget that there even are bots on this site until someone mentions it in a comment.
Definitely a high presence of US users and the occassional (western) European among all.
Most of the times they represent themselve through their instance.
But it's the same as with Reddit: Mentioning a thing without mentioning a country = US.
Ah, my favorite way of trolling when I felt like it. Dispute something and eventually go "Ah, sorry didn't know you were US specific with this" when I finally learn the revelation.