Other topics included chronic diseases, infectious diseases, surgery, injury prevention, pharmacovigilance, sexual and reproductive health, and adolescent psychology with functional magnetic resonance imaging.

More than half of the included articles were related to mental health and substance abuse (n = 39, 59%). Of the 54 observational studies, 38 studied Instagram 12, Pinterest 7, Tumblr and 6, Flickr some studies investigated more than 1 platform. All 12 experimental studies used Instagram. Sixty-six research articles were included. Only public health-related, peer-reviewed research articles were included (excluding surveys of self-reported social media use).

We searched EBSCOhost Academic Search Complete, PubMed, and Web of Science in January 2016, April 2017, and November 2017, with the following keywords: Pinterest, Instagram, Tumblr, or Flickr. No known systematic review exists that summarizes the existing research and its health implications. Image-based social media Instagram, Pinterest, Tumblr, and Flickr have become sources of health-related information and tools for health communication.

Flickriver photos