BuzzFeed began in 2006 as a way of harnessing the virality of internet memes, and almost accidentally became a prominent force in investigative journalism, writes Bevan Hurley.

Two men developed psychosis after becoming infected with Covid-19. One of them ultimately received treatment after his concerns were repeatedly dismissed, while the other died of a possible suicide. Now, their families are trying to raise awareness about the rare and devastating condition. Andrea Blanco reports