Dunkin’ Run: be a hero through donuts

In this new era of applications, Dunkin’ Donuts released a really cool one called “Dunkin’ Run”. Probably you know how complicated is ordering coffe for a group of people in an organized way. Using this app, you can become a “runner” while they fill what they want and then get yours and your friend’s goods from the general Dunkin’ Donuts menu, you can see a little video explaining how it works.
What appears interesting to me (besides the obvious use) is the way in which the application spreads, not only by using or because someone recommended, but also by ordering something when a friend of yours is the runner and asks you if you want him to pick some coffee for you.