solvr.png is a site that invites you to solve problems step by step.
You can do this collaboratively by sharing the web address for your discussion.
For example, have a look at this discussion in Edna's Torah class: Jacob needs to get to Lavan.

From the website :
helps you structure your thoughs clearly. You can solve problems also together with others.

How it works
1. You enter a problem.
2. You enter ideas that could solve the problem.
3. Some ideas lead to new (hopefully smaller) problems.
4. When a problem is solved, the tree gets green.
A problem is considered solved, when you found an idea that does not lead to a new problem."

This is our first problem: How can we use Solvr with our students?