Business Insider - Facebook's News Feed has always been something of a mystery. Some posts show up in the feed, some don't. The feed has become over run with all sorts of content and Facebook uses an algorithm to manage it. But, no algorithm is perfect. CEO Mark Zuckerberg found this out when the top story in his feed was a co-worker's birthday. At the same time, his niece had been born. According to a new Steven Levy story in Wired, when Zuckerberg saw his co-worker's birthday ranking ahead of his niece's birth, he asked for a tweak to Facebook's News Feed algorithm. The tweak was that if the word "congratulations" is in the comments, a post gets a boost.  This makes sense, congratulations is the #1 thing people say in response to huge events, like an engagement, a graduation, a new baby, or a new job â exactly the kind of stuff that Facebook wants to surface. "Weâre testing a lot of things every day to figure out whatâs going
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