Mobile ad network Chitika measured traffic from tablets and smartphones via impressions on both the period leading up to Christmas and the period immediately following, and found a few devices grew their share significantly, while others didn’t fare so well. The iPhone 5 was the top gainer in smartphones, growing 1.11 percent overall following Christmas day; the Samsung Galaxy S III also grew 1 percent. But there was greater variance among tablets, where the Kindle Fire grew considerably, and iPad share actually dropped off.