Stop Mandatory Vaccination
The Stop Mandatory Vaccination website and associated Facebook group are some of the major hubs of the American anti-vaccination movement. It was established by anti-vaccination activist Larry Cook in 2015.

The total membership of the public Facebook page and the private group reached 360,000 before it got closed down in November 2020. The website is owned by Larry Cook, who describes himself as a "healthy lifestyle advocate." A former sound technician and Executive Director of the California Naturopathic Doctors Association, he first used social media platforms to promote conspiracy theories and ineffective treatments for autism before he became a leader of the anti-vaccination movement although he has no medical background. He created the site in 2015, in reaction to California limiting exemptions to vaccination requirements in schools.

Members used the Facebook group to disseminate conspiracy theories, for example stating that news about epidemics are manufactured by governments to incite people to vaccinate, that the public health measures taken to minimize the impact of the COVID-19 pandemic aim at preparing mass forced vaccination or that the 1918 influenza epidemic was caused by vaccines. During the COVID-19 pandemic, Cook used the group to oppose mask-wearing legislation in certain situations. Cook wrote that opposing mask-wearing is a precondition to opposing COVID-19 vaccines when they would become available.

Both Facebook and Twitter removed the Stop Mandatory Vaccination accounts from their platform in November 2020, as part of their measures to limit the spread of QAnon misinformation. After losing his Facebook presence, Cook created a website specifically about COVID-19, Qanon and parenting, but it has been growing slowly.
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