![]() Instagram was launched in 2010 as an iPhone app, through which users upload and share photos. Pinterest launched its iPhone (Apple, Cupertino, CA) application (app) in 2011, and quickly became one of the major social media sites. Other users can “re-pin” these images onto their own boards. Pinterest was launched in 2010 as a Web site where users can save an image (known as a “pin”) that they upload or find on a Web page onto their “boards,” which is a collection of these pins. 4 In 2018, Tumblr banned pornographic contents and triggered a debate on the line between pornography and the arts as well as backlash from certain members of the lesbian, gay, bisexual, transgender (LGBT) communities who feared that certain expressions of their identities were being censored. 3 In 2012, Tumblr prohibited self-harm materials, including “pro-ana” contents. Tumblr was founded in 2007 as a microblog that allows users to post multimedia and was acquired by Yahoo! in 2016. It was acquired by SmugMug, a paid photo-sharing service, in 2018. Flickr evolved and found its niche among photography enthusiasts. Origins of Flickr, Tumblr, Pinterest, and Instagramįlickr was a pioneer in online photo sharing when the Web site was founded in 2004 and saw its heyday when Yahoo! bought it in 2005. 13 As of March 2019, there were 90 million monthly users of Flickr. 11, 12 In January 2017, 1.3 billion Tumblr posts were published. (See Sidebar: Origins of Flickr, Tumblr, Pinterest, and Instagram for an overview of the origin of these platforms.) The number of global monthly active users reached 800 million for Instagram and 200 million for Pinterest by 2017. Instagram, Pinterest, Tumblr, and Flickr are examples of social media platforms that emphasize their image-sharing capacities by positioning the image at a prominent location when sharing. The applications of social media in public health have attracted increasing attention, with relevant systematic reviews published focusing on specific health conditions and interventions 4– 8 and specific areas of health-related research. 1 Images reduce the complexity of the message while creating an appealing visual for the audience. ![]() 3 Images are important in communicating health-related information to the targeted demographic. 1, 3 Health agencies use billboards and photos to promote healthy behavior visually and infographics to present summarized data to the general public. Images, such as photos, pictograms, and infographics, are powerful tools of health communication 1, 2 because of their potential impact on people’s knowledge, attitudes, and perceptions regarding health-related issues.
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