I encourage you to visit the site known as Today’s Meet. It is a site where you can host online discussions, and there is no sign up needed. You simply visit the site, name the meeting room, decide how long you would like the conversations to remain, and send out (to desired participants) the URL that is generated when you create the room. The duration options range from 2 hours to 1 year. This way, you, your students, or peers may revisit the discussions you had on a particular day.
Some classroom applications would be to collaborate with other classes within your school or district, or even buddy with a teacher across the country or in another part of the world to participate in discussions related to curriculum.
A helpful resource for ideas about Today’s Meet is Lisa Johnson’s Blog (another ITS).
Be sure to let me know how it goes if you use this in the classroom.