1. Picnik grew from 0 to 42 million unique visitors per month through leveraging powerful influencers by integrating their photo editing tools directly into popular websites and services like Flickr, Photobox, Yahoo! Mail, and Facebook. 2. They also focused on great SEO and creating APIs that allowed their tools to be easily cloned and spread across different platforms. 3. Some luck also contributed to their growth, such as positive coverage in TIME magazine that labeled Picnik as the "Einstein of photo editing programs."