“Now, if an ad explicitly discourages someone from getting a vaccine, we’ll reject it,” the company’s Head of Health Kang-Xing Jin and Director of Product Management Rob Leathern said in a blog post Tuesday. The new ban comes amid a series of policy changes announced by the company to rid its social networks of problematic content it had previously been hesitant to remove. This includes a ban on Holocaust denialism announced earlier this week, a ban on pages and groups espousing the QAnon conspiracy theory last week, a temporary ban on political ads following the Nov. 3 U.S. election, a...