Seventeen years after the dawn of social media marketing, this medium continues to be an intriguing puzzle—a place where brands are investing more time and money, but are still struggling to determine what works well and where the returns on investment can be found.
https://www.forbes.com/sites/hbsworkingknowledge/2017/09/18/likes-lead-to-nothing-and-other-hard-learned-lessons-of-social-media-marketing/#300d3c5242c9/
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