TBF, with the exception of 4chan, these are all microblgging platforms occupying the same problem space. Lemmy is more like Reddit (unmentioned), which is not only more long-form, but has a different mechanism of organization: people self-organize by topic, not by following personalities. Lemmy & Reddit replaced Usenet. Twitter et al were a new, different paradigm.
4chan is in there to be funny, but shares more with Lemmy and Reddit than micro-blogging sites.
This is a very good paraphrase from an excellent series, Yes Prime Minister (formerly Yes Minister). In the scene, the Prime Minister (dude in the middle) is explaining to the Permanent Secretary (dude on the left) the difference between the various English newspapers. The Permanent Secretary is famous for giving lengthy and exceptionally convoluted monologues in which he says nearly nothing