It has never been easier for brands to find celebrities, or so-called influencers, to promote their products. And it has never been more complicated. “It’s just legwork. It’s not hard work. It’s just time-consuming work,” said Dave Snyder, senior VP and executive creative director at Firstborn. Earlier this year, Adidas tasked the Dentsu Aegis Network-owned digital agency with arranging an influencer-driven Instagram Stories campaign to promote its latest sneaker.