Fediverse

That format was pretty good for "Come see us live at the Sodbury Theatre in Glurpfortshire, Feb 32nd @9PM!"

I remember an instance where a Cracked.com article pointed out something like "5 creepy places on the internet" one of which was a dicussion forum in which one account was posting over and over, many times a day, about public appearances and such of the cast of Buffy the Vampire Slayer, and readers showed up en masse to harass this person. Turns out she was off-label using a forum engine as her own little microtwitter to publish alerts to a fan club. But when the Cracked author rejected that context and substituted his own, it smelled a lot like Humanbeing151.

But yes in general I find discussion boards to be more useful; I think it's why they were invented first; Reddit and Lemmy are basically just different approaches to implementing Usenet.