I just used Todays Meet in my clasroom today and the kids loved it. You need to sign in and then give the URL to the students so that they are also on the site. Todays Meet allows the people who are logged on to write comments and share ideas instantly. These posts appear on a feed similar to Twitter. I can see this site being used to allow the students to communicate their thoughts during class discussions and share thinking after a working in a group. Today I used it for students to communicate their thoughts (as they had them) while I was reading to them. Check it out!