Digg:
It had potential, but after becoming an ai news aggregator now there’s none.
Lemmy:
Low engagement / kinda dead. Also, I have heard that the growth is slowing down(somebody pls provide a citation for this).
Besides that, it’s pretty much reddit, for better or for worse.
9gag:
I just made a post there, my first impressions are not good. Got insulted and my post got removed. Now, that might have something to do with me not understanding how the website works, but only time will tell. I will spend more time there to see if it’s worth anything.
Do you want to see communist content more? Lemmy.ml or something like Lemmy.zip can maximize federation. Do you want to pretty much only see content from leftists of various stripes, and want to defederate from non-leftists? Hexbear.net is nice too. It depends on what you want.
Personally, I think the best thing to do is scroll some instances locally without an account and see if you like the vibe, then transfer over to the one that fits you the best.