Are you interested in learning about current news or historical events...participate in the Story Chasers blog/wiki. Students and teachers can research such items in their local communities and share them in a collabortive way via connections on this site.
chat service that does not require chat participants to register or create their own user name or password. To use Stinto one person establishes the chat and then invites others to join the chat by sharing the unique url for the chat.
Today's Meet gives you an isolated room where you can see only what you need to see, and your audience doesn't need to learn any new tools like hash tags to keep everything together.