Although Microsoft's Collections mapping feature isn't as well-known, it was actually released
well before Google's "My Maps" custom-mapping feature.
The push pins are inflatable, about 8 feet x 4 feet. Since they're technically considered art installations, they didn't have to go through the city permit process. Microsoft didn't pay to install the pins. Instead, the businesses assume they'll be getting some attention out of the arrangement, as well. The pins will be in their current locations for a couple of weeks; Microsoft may be expand the campaign to other cities if it is successful.