From the first moment I first went online in 1996, forums were the main place to hang out. In fact the very first thing I did was join an online forum run by the Greek magazine "PC Master" so I could directly to my favourite game reviewers (for me it was Tsourinakis, for those old [...]
People prefer centralization, and it makes sense. The Fediverse resolves most of the issues with decentralization, but so does centralization, which came way sooner, and arguably did it better.
Also, people seem to forget that Facebook was pretty cool back then. It had superior features, and was not the buggy mess it is today.
Anything big enough becomes a public restroom. Cooperation and syncronization between groups small enough not to devolve in that way seems to be an especially promising path forward.