The document discusses Salesforce.com's API journey. It notes that Salesforce currently services 500 million requests per day, with 60% (300 million) being API calls. It then outlines Salesforce's strategy to keep APIs simple and flexible while enabling integration, custom application development, and parity with platform features. The document also discusses the historical evolution of Salesforce's APIs from 2001 to present day and the addition of REST APIs to align with modern technologies like HTML5 and mobile platforms. Finally, it covers the Chatter API's shift to returning full object graphs via REST to improve performance over individual object calls.