The world’s largest social media network said in a blogpost that changes include clearer guidelines for human editors on the Trending Topics team, more training to emphasize avoiding ideological or political basis, and more robust review procedures.

The internal investigation was prompted by a letter from Republican Sen. John Thune earlier this month demanding that the company explain how it selects news articles for its “trending” list. 

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http://www.huffingtonpost.com/entry/facebook-trending-political-bias_us_57439555e4b00e09e89fdd9e?utm_hp_ref=trending-topics
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