Facebook missed weeks of warning signs over Capitol attack, documents suggest

Materials provided by Frances Haugen to media outlets shine light on how company apparently stumbled into 6 January

As extremist supporters of Donald Trump stormed the US Capitol on 6 January, battling police and forcing lawmakers into hiding, an insurrection of a different kind was taking place inside the world's largest social media company.

Thousands of miles away, in California, Facebook engineers were racing to tweak internal controls to slow the spread of misinformation and content likely to incite further violence.