Facebook's "vexing and heartbreaking" decisions are causing significant setbacks for civil rights, an audit commissioned by the company says.
The two-year-long review says its actions have left many activists "disheartened, frustrated and angry".
Facebook has already said it will make some - but not all - of the changes called for in the 100-page report.
The official number of advertisers boycotting Facebook over its civil-rights policy is now at nearly 1,000.
Facebook commissioned the review in May 2018, a month after founder Mark Zuckerberg faced intense questioning at a congressional hearing.
"With each success, the auditors became more hopeful that Facebook would develop a more coherent and positive plan of action that demonstrated, in word and deed, the company's commitment to civil rights," it says.