Facebook CEO Mark Zuckerberg says in a post on his personal page that he’ll be meeting with “leading conservatives” and others across the political spectrum after a report the social media giant was suppressing conservative news stories.

“We have found no evidence that this report is true,” Zuckerberg wrote in his Thursday post. “If we find anything against our principles, you have my commitment that we will take additional steps to address it.”

The efforts come after a story on Gizmodo in which former Facebook “news curators” claimed they regularly “injected” selected certain stories and suppressed conservative news stories about a range of topics.

The story prompted Sen. John Thune, R-S.D., to send a letter to Zuckerberg about how the site controls its Trending Topics feature. Specifically, Thune asked Zuckerberg how stories in Trending Topics get approved, whether news curators can manipulate the list’s content, and what steps Facebook is taking to investigate these claims.

On Thursday, Justin Orofsky, vice president of global operations for Facebook, posted on how the Trending Topics feature works.

“Topics that are eligible to appear in the product are surfaced by our algorithms, not people,” Orofsky wrote. In addition, Orosky said Facebook does not allow reviewers to “add or suppress political perspectives.”

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