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MIAMI (CBSMiami/AP) — Social media giant Facebook says they have found no evidence to prove that their contractors suppressed stories of interest to conservatives in its “Trending” section.

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Facebook vice president of search Tom Stocky writes in a post, “There are rigorous guidelines in place for the review team to ensure consistency and neutrality,” adding that the guidelines don’t permit political perspectives to be suppressed or one viewpoint or outlet to be prioritized over another.

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Stocky also says an allegation that the site artificially forced the Black Lives Matter movement to trend is “untrue.”

Facebook is responding to a Monday report from Gawker’s Gizmodo blog on claims from unnamed former Facebook contractors who worked as news curators for the company.

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