On this page here, there are columns for:

Name–Subscribers–Users / month–Posts–Comments

When you hover the mouse over the column labels, it looks like you can click them to sort the page, but nothing happens when you click. It would be cool if you could sort by Users/month or Subscribers when looking for communities to subscribe to, both if you are looking for big communities or smaller ones. Does anyone know if that’s something the devs are considering?