New York -- The hot social-sharing site Pinterest has released its first API for developers. It will help stores and brands display which of their items were most frequently and recently pinned. The first partners for the service include Zappos, Walmart, Disney, and Nestle, reflecting how the site is looking to increase revenue generation with advertising and cross-marketing. (An API, short for application programming interface, is code that allows developers to create apps that interface with a popular web service or other software.)