A new survey finds about half of U.S. adults under 50 get health information from social media influencers or podcasts. The analysis by the Pew Research Center of nearly 7,000 influencers also found less than half described themselves as healthcare professionals. Experts say the key to being a smart consumer of health content is to look for credentials, think twice when people speak in absolutes, follow the influencer money and confirm with a trusted health professional before acting on anything you see online.