Wallwisher is great for brainstorming. Get the thoughts out there and then arrange them later. Do this as fast as you can with the kids no boundaries just get the thought out!!!
"Advice and First Steps for Educational Leaders to Lead by Example
Please provide Advice, First Steps, or Next Steps to Educational Leaders (superintendents and principals and other key leaders) on what he or she must do to lead by example to further 21st century learning for students and staff."
"What do you think about alcohol?
Lots of teenagers get involved in binge drinking and using alcohol in an abusive way. What do you think about alcohol?"
A blog post about Edistorm. It is a free, Post-It Note style brainstorming tool. An alternative to Wallwisher, but probably geared more towards a corporate setting. There is a limited Free account, as well as, an inexpensive Educator account. A neat collaboration and communication tool worth checking out.