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The effectiveness of public health advertisements to promote health: a randomized-controlled trial on 794,000 participants | npj Digital Medicine
Our results show that 48% of people who were exposed to the ads made future searches for weight loss information, compared with 32% of those in the control group—a 50% increase. The advertisements varied in efficacy. However, the effectiveness of the advertisements may be greatly improved by targeting individuals based on their lifestyle preferences and/or sociodemographic characteristics, which together explain 49% of the variation in response to the ads. These results demonstrate that online advertisements hold promise as a mechanism for changing population health behaviors.
Social Advertising Isn't Really Driving Conversions - eMarketer
An August 2017 survey from CivicScience, a next-generation consumer and media analytics company, found that very few US internet users have made a purchase based on ads they saw on social platforms, like Facebook or Snapchat.