https://techcrunch.com/2020/12/16/twitter-will-force-users-to-delete-covid-19-vaccine-conspiracy-theories/

With COVID-19 vaccinations just beginning, Twitter will ramp up its efforts to tamp down conspiracy theories that might discourage people from getting the vaccine.

The newly expanded rules apply to debunked information about the adverse effects of getting vaccinated, misleading tweets claiming the vaccine is not necessary and conspiracies that claim COVID-19 vaccines are used to “intentionally cause harm to or control populations.” Twitter’s updated policy will go into effect on December 21.