Here is a follow up interview with Raj Kadam, CEO of Viralheat API whom we have interviewed on the Sentiment Analysis API here. In 2012, Viralheat had about 30 billion calls over all its' APIs. Viralheat just announced a new API called Human Intent API.
Last month, GraphEffect announced an API that allows multiple parties/companies to collaborate on projects using their own marketing/collaboration tools. Now, GraphEffect has launched another platform, Shift.com, that empowers applications to communicate with each other.