1) Set up a googledoc with your questions or provocations
2) Set the sharing options to open to all, can edit
3) Assign each child a color
4) Let them loose
There will be a flurry of fighting and jostling for position at the beginning, but once the comments start rolling in, it self-organizes. The first time you try, it will not be smooth. Stick with it. Once you get the hang of it, it is a great activity. This is a powerful way to collaborate, and a fun tool that kids love!