That's kind of missing the point. For casual communities, it's easier to just not post. I don't care enough about posting that awesome recipe for brussel sprou

That's kind of missing the point. For casual communities, it's easier to just not post. I don't care enough about posting that awesome recipe for brussel sprouts with bacon lardons to go through the effort of setting up a custom domain so I can sign up for an anonymized facebook account so that I don't have to worry if it will show up in my family member's news feeds. I barely care enough to tweak facebook settings to keep it hidden. I also don't necessarily want to share who I am, where I work, what my other hobbies are, and so on to the world, which means that in the absence of a good anonymous forum implies that I'd prefer to keep my posts restricted to a more private audience, so I don't necessarily feel like posting with my facebook account. As the weakly anonymous communities are dying or shrinking, the separation of "who I am" and "what I do" makes it more difficult to share the interesting things I know publicly without exposing my real world identity. Since I don't care much, the post doesn't happen, and I move on with my day. And the internet is a little bit poorer for it. I suspect that lots of little dyanmics and frictions like this are what's killing the 'old way Americans used the internet'. It's theoretically possible to fight this. But for almost all casual content, the friction is just not worth overcoming.