So this is how Google is trying to get more people familiar with their local business reviews product, and compete with Yelp; at popular events for the San Francisco Hipsters you might see a team hired by Google trying to convince people to try out the product. They actually expect you to review a couple of local businesses right there on one of the laptops. Just to make you familiar with the product. And what do you get for all the data you just entered and the time you spent, right.. a T-shirt.
Google local reviews, trade a t-shirt in exchange for your time and local knowledge, write some reviews on local businesses and learn how the system works