Business Insider - It has been a less profitable holiday season for many online retailers thanks to a small change Facebook made to how the site works. On December 2, Facebook published a post on its official blog announcing that it had made a small change to the algorithm that determines what users see on the News Feed â that center column of status updates, news stories, and photos you see when you go to Facebook.com or open a Facebook app. In the blog post, Facebook said it was tweaking the algorithm to favor more "high quality" news stories â articles that surveyed Facebook users say they prefer over funny photos and the like.  At first, Facebook-watchers took the company at its word, and assumed the tweak would only harm meme-oriented publications like Viral Nova and Upworthy get from the News Feed. And maybe Viral Nova and Upworthy have been hosed by the change. But, if so, they aren't the only big losers. So are a whole class of retailers. Over the past five
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