Potentially earning thousands per post, influencers are cashing in on their ability to captivate large audiences and thus heavily impact the purchasing behavior of their followers. It's clear why brands keep throwing products and money toward these social media stars -- influencer marketing works. The top 50 Instagram influencers have more than 3.1 billion followers, as reported by Social Blade, and overall, 3.028 billion people, or 40 percent of the world’s population, activ