Bolstered by the popularity of its viral holiday greeting site ElfYourself.com, OfficeMax surged 395% to 2.7 mln visitors, making it the top-gaining property for the month, according to comScore. Photo-sharing site Slide.com increased 39% to 2.1 mln visitors in December, while social networking destination Skyrock Network jumped 32% to 1.9 mln visitors. Online holiday shopping activity saw Best Buy Sites jump 32% to 6.8 mln visitors, while Wal-Mart saw a 15% increase to 4.2 mln visitors. The preparation of holiday meals also seemed to be foremost on Canadian minds, with Kraft Foods increasing by 27% to 2.9 mln visitors.