Meta apologized for graphic and violent content recommended on Instagram Reels on Wednesday.Meta replaced US fact-checkers with a community notes model in January.Meta's content moderation has faced criticism and controversy for years.Meta apologized for an "error" after Instagram users reported a flood of graphic and disturbing content recommended on their feeds."We have fixed an error that caused some users to see content in their Instagram Reels feed that should not have been recommended," a Meta spokesperson said in a statementInstagram users worldwide reported seeing a flood of short-form videos showing gore and violence, including killings and cartel violence, on Wednesday. These videos were marked with the "sensitive content" label but were being recommended to users back-to-back.Meta, which owns Facebook, Instagram, and Threads, says it removesIn the first week of January, Meta replaced third-party fact-checkers on its US platforms with a community notes flagging model.The company also planned to "simplify" its content policies, said Joel Kaplan, the chief global-affairs officer, at the time. Meta would "get rid of a bunch of restrictions on topics like immigration and gender that are just out of touch with mainstream discourse."In January, Business Insider reported that the tech giant would officially end its US fact-checking partnerships in March.Meta has faced a string of controversies since 2016 over lapses in content moderation. It has faced criticism for, among other issues, its role in illicit drug sales. Last year, founder Mark Zuckerberg joined other tech CEOs for a Congressional grilling about safety measures for children online.Internationally, Meta's lack of content moderation and reliance on third-party civil society groups to report misinformation have been found to play a role in proliferating violence in Myanmar, Iraq, and Ethiopia.Zuckerberg's content moderation changes resemble those made by Elon Musk on the social media platform X, which he bought in 2022.