While other social platforms also allow posting of images, with Pinterest you have the added advantage of categorizing your images into various "boards." This gives followers the opportunity to hone in more narrowly on their specific interest. If you're an organization with many products and styles, the platform gives you a way to narrow things down for your potential customers. The instant gratification of the right image lends itself beautifully to the online contest. By creating a site that asks people to share images of a selected topic, and to offer an incentive for posting, such as a prize or coupon, you have the ability to draw interest for your brand or organization. You can encourage people to create a board based on their favorite images from your site, and then broadcast that whoever gets the most pins and re-pins, wins.
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