Social media hosted a lot of fake health news this year. Here's what went most viral

The most common concerns among health professionals when it comes to misinformation online is compliance with health treatments or prevention efforts, said Nat Gyenes, who leads the Digital Health Lab at technology nonprofit Meedan and researches technology and health at Harvard University’s Berkman Klein Center for Internet & Society.

“It can lead to vaccination levels below herd immunity, harmful impacts on minors whose parents are responsible for their health care and well-being, engaging in alternative or homeopathic treatments as a primary approach and only complying with necessary medical treatments at a time where effectiveness is decreased,” Gyenes said.