Social-media endorsements are the latest thing in advertising

http://www.economist.com/news/business/21708717-social-media-endorsements-are-latest-thing-advertising-gold-posts
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Yet as media agencies and brands have piled in, the grey area between voluntary celebrity endorsements and paid advertisements has grown murky. Not all influencers label their posts clearly with “#ad”. Consumer watchdogs are crying foul. One, Truth in Advertising, recently accused Ms Kardashian and her sisters of running “deceptive marketing campaigns”.

http://www.nytimes.com/2016/08/30/business/media/instagram-ads-marketing-kardashian.html?_r=0