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Fifty Shades of Grey was Amazon's #1 book of the holiday season. Well! Not exactly what we'd put under the tree for dear old mom, but to each his own. In other Amazon holiday sales news, if each customer who purchased a copy of Just Dance 4 played the game for one hour, the total number of calories burned would equal half a million slices of fruitcake. Head over to Racked National for more fun facts. [Racked]