Meta — the owner of Facebook and Instagram — is struggling to fully contain and address hate speech ahead of the U.S. election, according to research shared exclusively with the Thomson Reuters Foundation.

Nonprofit Global Witness tested how Facebook was dealing with hate speech ahead of the presidential vote by analyzing 200,000 comments on the pages of 67 U.S. Senate candidates between Sept. 6 and Oct. 6.

When Global Witness researchers used Facebook's reporting tool to flag 14 comments that they considered particularly egregious violations of Meta's hate speech rules in its "community standards," Meta took days to react.