Thanks! Known is a great tool! How can I create private groups within a Known instance? Like for classes... is it possible with admin rights?

Torsten, If you were doing it for your own class, I'd recommend setting up your own instance as an admin and having your students join that with individual accounts. Then all the class interaction would be occurring in a stream, much like it is here at known.boffosocko.com. Another example I'm aware of is https://teach.kqed.org/.