This idea came to me last night:
In the spirit of Sharing and Collaboration, it would be really cool if we could open the (public) Flavor Stash of a fellow mixer and click a button to create a Common Flavor Stash.
Once you have a list of all common flavors between yourself and the other mixer, you could more easily create something for them to try out, either just for fun, or for collaborative creation of great recipes. Or, just as a challenge to spur creativity. No shopping necessarily necessary!