If you haven’t been living under a rock, you’ve probably heard of influencer marketing, which is the practice of enlisting social media (primarily Instagram) personalities to speak to their followers about a product or service. Despite some early this year chatter about advertisers doubting the authenticity of social media influencers, the business is still booming. While influencer marketing continues to have a good return on investment, the barrier of entry can be substantial, especially for macro and celebrity-level influencers.