I created https://hubski.com, which has been around for 9 years. Hubski isn't big, but we have a quality community that brings joy.

To grow, my friends and I just started posting and chatting.

Personally, I think commercialization is antithetical to some types of communities. I wrote this post titled "The social aggregator is a terrible business model" a few years ago: https://hubski.com/pub/219234