The American Medical Association has asked Amazon, Facebook, Google, Pinterest, Twitter and YouTube to combat vaccine misinformation on their social media sites.

Currently, vaccine-preventable diseases, particularly measles, are re-emerging across the United States due to anti-vaccine fervor. Social media has notably played a role in the anti-vaccine movement and has targeted parents seeking information on vaccines, according to the AMA.

Some social media outlets, such as YouTube, are now taking action by blocking anti-vaccine ads, and the AMA applauds those companies and encourages them to continue their efforts.