Paywall? I mean thanks, that'll be helpful for a lot of people and I might even change the link to the archived one, and the cookie options are a bit crap unless you block JS; but this isn't paywalled on my end.
Maybe it's because I'm in the UK? Although I'm using a VPN...
That's Bluesky. It's supposed to be a federated social media, but right now there's only one kind of software for it and you can't yet self-host it (although you can self-host your data). The open-source protocol, known as AT, was created by Twitter back in the day, and Jack Dorsey and a bunch of staff were able to rescue it when Musk took over.
AT does not federate with ActivityPub, but users of either protocol can appear on the other using Bridgy; and some Friendica instances have basic support for AT. The equivalent of "fediverse" is "ATmosphere" (with the first two letters capitalised).
Since it became public (as opposed to invite-only), Dorsey left the platform and went back to Nostr (yet another microblogging platform, this time built around blockchain :-P).
It's actually quite a nice place, in my opinion, with a vibe similar to a combination of Twitter and Tumblr.
Sorry for going into this much detail. I just really like explaining things.
EDIT: Turns out, the word being thrown around in place of "tweet" was also slang for cum. I have removed it, as this was probably originally a joke.
The same will happen with chlorobromohexane, which is what appears to be in the flask.