What if you wanted to create an app that allows people to "crowd-fund" gifts to be mailed to random residential addresses with a note inside that contains a unique URL that the person can enter into their browser to visit a page explaining the gift and offering them a way to say thank you to all the givers?

Most addresses aren't households; of the ones that are, a great number of those aren't currently inhabited. A lot of packages would be sitting at the doorsteps of new townhouse developments or vacant apartments.