Mailing lists are still around, and they still work. Even better, you don't have to log into 50 different sites to see the discussion. They're also not necessar

Mailing lists are still around, and they still work. Even better, you don't have to log into 50 different sites to see the discussion. They're also not necessarily beholden to a single central organization. Before doing anything fancy, consider the good old mailing list. That may be all you need.