With the social media influencer market set to be worth more than $10 billion by 2020, we’re starting to see the influencer marketplace take a recognizable shape. That shape can be split into four categories; mega-influencers, macro-influencers, micro-influencers and nano-influencers — and while it seems that the distinction between these four categories is merely the size of their following, the differences are really far more nuanced. And if you’re looking to dive into the lucrative world of influencer marketing, knowing a mega-influencer from a nano-influencer is absolutely essential.