Based on our record, Asgaros Forum should be more popular than Ning. It has been mentiond 2 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Why not? https://wordpress.org/plugins/asgaros-forum/. Source: about 2 years ago
Asgaros Forum does kinda what you're looking for: I setup Categories (Genre) and then in each was able to setup a Topic (forum) and then a sub-topic (chapter). This is what my layout looks like (quick messy setup). Source: about 2 years ago
I believe this exists since 2005, originally founded by Marc Andreessen and Gina Bianchini: https://ning.com/. - Source: Hacker News / almost 2 years ago
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