Wildfires are raging out of control across parts of Los Angeles. A fierce windstorm is fanning embers, billowing dangerous smoke across the city and turning the sky an apocalyptic red.

At least four blazes are spreading in Southern California, near the scenic coast, in Malibu and the Pacific Palisades, as well as further inland. Firefighters are struggling to work in the wind, and the fires are uncontained.

At least 30,000 people have fled. Some abandoned their cars and escaped on foot to avoid roads jammed with traffic. Residents of one nursing home evacuated on gurneys, officials said. Homes, landmarks and places of worship have been destroyed, and officials warned more destruction is coming.

Policing the truth on social media is a Sisyphean challenge. The volume of content — billions of posts in hundreds of languages — makes it impossible for the platforms to identify all the errors or lies that people post, let alone to remove them.

Yesterday, Meta — the owner of Facebook, Instagram and Threads — effectively stopped trying. The company said independent fact-checkers would no longer police content on its sites. The announcement punctuated an industrywide retreat in the fight against falsehoods that poison public discourse online.