Facebook rolls out pop-up windows on Facebook and Instagram that appear when people search for vaccine info; notices point to CDC or World Health Organization (Jacqueline Howard/CNN)

Jacqueline Howard / CNN:
Facebook rolls out pop-up windows on Facebook and Instagram that appear when people search for vaccine info; notices point to CDC or World Health Organization  —  Facebook to crack down on anti-vaccine misinformation  —  (CNN)A new feature is rolling out on Facebook and Instagram to combat the spread of anti-vaccine misinformation.