Retailers often overlook Pinterest as a revenue-generating social platform. But Pinterest users are active buyers. A total of 75% of Pinterest users say they're always shopping, and 44% of millennial Pinners purchased a product they saw on Pinterest. Now, take this hotbed of sales and add a sprinkle of seasonal magic and you've got a winter wonderland for retailers. So how do top retailers use Pinterest to drive sales in the holiday season? Let's unwrap some tips.