Poll a group on a map
A poll here is a map, a question, and the answers people can give. "Which of these would you move to", "rate these by how safe they feel", "which ones are worth the trip". Everyone who opens the link answers on the same map, and the answers average as they arrive.
One answer per person
Changing your mind moves your own answer rather than adding a second one, so a result is a count of people rather than a count of clicks. A browser cookie is what does the counting, which stops the same person answering twice and is not trying to be proof of anything more than that.