CEO Mark Zuckerberg has banned from his social media platforms any claims that the novel coronavirus vaccine alters DNA, although he himself expressed similar concerns last year. Project Veritas released video Tuesday of Mr. Zuckerberg raising questions about whether vaccines include risks of side effects such as "modifying people's DNA and RNA" in July during a virtual Q&A meeting with staff. "I do just want to make sure that I share some caution on this because we just don't know the long-term side effects of basically modifying people's DNA and RNA to directly code in a person's DNA and RNA," Mr. Zuckerberg said in the video. "Basically the ability to produce those antibodies and whether that causes other mutations or other risks downstream." In a Feb. 8 post, Facebook updated its COVID-19 and vaccine policies "to protect people from harmful content and new types of abuse related to COVID-19 and vaccines," saying it would remove posts that included "Claims that the COVID-19 vaccine changes people's DNA." Project Veritas president James O'Keefe said that the newly leaked tape showed Mr. Zuckerberg "violating his own code of conduct" and that "he would be censored on the platform today for what he said." "Isn't it interesting that Zuckerberg can vacillate and evolve his thinking on the subject of vaccines, but as soon as he's made up his mind or appears to have made up his mind on the topic, he disallows the almost three billion Facebook users to do the same?" Mr. O'Keefe asked.