SAN FRANCISCO, CA - NOVEMBER 25: Shoppers download the eBay mobile app to enjoy a free treat from Kara's Cupcakes and holiday shop on eBay right from their smartphone in Union Square on November 25, 2011 in San Francisco, California. (Photo by Steve Jennings/WireImage)

SAN FRANCISCO, CA - NOVEMBER 25: Shoppers download the eBay mobile app to enjoy a free treat from Kara's Cupcakes and holiday shop on eBay right from their smartphone in Union Square on November 25, 2011 in San Francisco, California. (Photo by Steve Jennings/WireImage)