Stack Overflow announced a new feature: Collectives. It enables building sub-communities on Stack Overflow. I would presume this is similar to sub-reddits.
We’re already advocating Stack Overflow as a Q&A platform for Crystal (Community - The Crystal Programming Language) and I think it would be great to have a Crystal Collective there. I would expect it could help us collect and discover Crystal related questions and make it more accessible. Currently, Crystal related questions are only identifiable via the crystal-lang tag.