evidence: In just a few months, the #DiedSuddenly meme has become a presence on most major social platforms, including Instagram and Facebook. At the end of 2022, researchers and reporters pointed to large Facebook groups dedicated to "Died Suddenly News." Last week, I was able to join a community that was created in October and had more than 34,000 members. They referred to themselves as "pure bloods" and to vaccines as "cookies" or "cupcakes," and alternated between mourning "sudden deaths" and gloating about them. And they had been careful to evade detection by Facebook’s automated content-moderation systems: Group administrators asked them to write about "de@ths and injury from the c0v1d sh0ts" and "disguise ALL words that have any medical meaning." (Facebook removed the group after I inquired about it.) But "died suddenly" thrives on Twitter. Tweets referencing news stories about unexpected deaths can be flooded with replies trumpeting the conspiracy theory, which go unmoderated. It’s a radical change from the earlier years of the pandemic, during which Twitter implemented new policies against health misinformation and updated them regularly, gradually finessing the wording and clarifying how the company assessed misleading information. These policies and the tactics used to enforce them tightened as the pandemic went on. According to a transparency report the company published in July 2022, Twitter suspended significantly more accounts and removed far more content during the vaccine rollout than during the earliest months of the pandemic, when various groups first expressed concern about dangerous misinformation spreading online.