A few hours after The Guardian obtained Facebook’s internal guidelines for selecting “trending” news stories, Facebook has decided to publicly release an updated version of the document.
Once those topics are “surfaced,” however, Facebook’s journalists help make the decision about what is actually trending. Facebook says its algorithm pulls from roughly 1,000 news websites, which its human editors then use to help populate the top stories. It has a separate list of “Media 1K” domains that the company considers “trustworthy,” which doesn’t always align with the RSS feed.
One notable change between The Guardian’s documents and the one Facebook just posted: Yahoo News is no longer considered among the most trustworthy news sites; Buzzfeed News has replaced it.
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