Facebook and Instagram users seeking vaccine info will now be directed to the World Health Organization's (WHO) research, via pop-ups. U.S. users will be directed to the Centers for Disease Control and Prevention. Dr. Tedros Ghebreyesus, Director General WHO, via CNBC The WHO has described the spread of false vaccine information as "a major threat to global health." The WHO says such inaccurate information could even "reverse decades of progress made in tackling preventable diseases.” In 2019, the U.S. has been host to 1,234 measles cases in 31 states. That number is triple the amount of cases from 2018 and the most in almost three decades. Public health experts have largely placed the blame for the significant uptick in measles cases on online anti-vaccination content.