PC World - Facebook is retooling its ranking system to make some news articles appear more prominently at the expense of other content such as certain photos, the company announced Monday.No longer just a site for connecting with friends, Facebook lately has been showing off its digital newspaper ambitions. Just last week, for instance, it was revealed the company was testing a new feature to let users save article links to a list for later reading.And when Facebook redesigned its News Feed earlier this year, CEO Mark Zuckerberg said the company was trying to give its billion-plus users the "best personal newspaper they could find."The new rankings are designed to make high-quality content appear more prominently in Facebook's central News Feed, Facebook's engineers said in the company's announcement. How Facebook defines "high quality" is a little obscure, though it appears to be related to how often articles are clicked on on mobile devices and whether the link is for a news ar
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