The evolution of geosocial can be traced back to the implication of social application programming interfaces by internet-based corporations in the early 2000s. eBay uses one of the oldest, announcing its social API at the end of 2000 and allowing free access to over 21,000 developers in late 2005. Amazon's primary API was released in 2002, which allowed developers to pull consumer information like product reviews into third-party applications. Google, Inc. began testing an API in April 2002 and currently owns dozens that are used by thousands of applications.