In short, the answer to your question is that it's social media. It's always social media.

Unfortunately, in this case it's twitter in particular, and now maybe Bluesky.

I worked on open source projects for years, and resisted as much as I could. But all of the communication besides technical discussion happens on Twitter. This includes networking between devs, quick feature requests, examples of work being done with the libraries, and also plenty of shout-outs and words of appreciation. Somehow even a bunch of technical support via screenshots. It's also where I get around half of my clients as a freelancer.