Outdoor brands The North Face, Patagonia and Rei have pulled their advertising from Facebook platforms.
The Stop Hate For Profits campaign is calling on brands to join the boycott during the month of July.
The North Face said it was halting ads "until stricter policies are put in place to stop racist, violent or hateful content and misinformation from circulating on the platform."
Facebook said it was committed to "advancing equity and racial justice".
"We're taking steps to review our policies, ensure diversity and transparency when making decisions on how we apply our policies, and advance racial justice and voter engagement on our platform," it said in a long post, published on Sunday.
Patagonia said it would also be joining the boycott until "at least the end of July".
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