I’ve been contemplating that problem in relation to Facebook. I had a forum that had relatively low activity, and the sole admin disappeared. When I finally got ahold of him, he suggested start a Facebook group.

While I think this would have less friction to discover, I find Facebook groups to be super disjointed. It feels more like a bunch of people talking at the group, rather than conversations, and it feels very transitory - which falls in line with Facebook’s approach: the most important thing is what’s next.