A big problem is that a lot of community content went behind Facebook. Instead of creating webpages or forums people started using Facebook pages and Facebook groups. This is the main reason I have been anti Facebook for over a decade. Not because of privacy reasons as many are but because I saw that Facebook will put the web behind it's closed doors. Even today some of the best reviews about any product or service are usually in enthusiast community forums. But a lot of that activity has gone behind closed doors of facebook and now reddit. Most of the current thriving forums are those that pre existed Facebook.
