Snapchat might be a hard nut to crack for many brand marketers because of its lack of metrics. But Birchbox knows how to turn its Snapchat followers into buying consumers through a simple trick: Vanity URLs. Over the Black Friday and Cyber Monday weekend, Birchbox created a simple URL — birch.ly/Steals — exclusively for Snapchat to showcase its special holiday deals like Kiehl's skincare set. The company saw more traffic to its site from this hack than organic Facebook posts.