Thread:CustardBursts/@comment-3183460-20180810212734/@comment-3183460-20180810215423

You can find all the info on the page ;) Essentially it's a way to group communities together who share a genre or topic in common - showcasing the most active. There's nothing required of sites except the footer be added to their main page (at the bottom), and then continue to do as they already are doing in terms of updates and such.