I think calling this a Web App is a bit generous. It's a poll with 2 options. Have you gotten even a single sign up for the service you are trying to promote? Getting a few thousand people to visit a web page and click a button does not equal business value.

This is a good example of creative thinking, but you should have waited until the experiment ran its course and reported on the results. I'm guessing that the number of sign ups won't be worth the 1 hour spent coding the app. You'd be better off working on something worthwhile and buying some traffic through Adwords.