There are still some community forums that have withstood commercialization and that are run by passionate enthusiasts. I'm mostly active in German forums and I

There are still some community forums that have withstood commercialization and that are run by passionate enthusiasts. I'm mostly active in German forums and I can think of sites like mikrocontroller.net (micro-electronics related discussions), kaffee-netz.de (coffee, espresso related discussions) and aquariumforum.de (aquarium-related discussions). I'd imagine there are tons of such forums in other areas and in the US as well.