The Swipp API allows developers to integrate Swipp's "Social Intelligence" into their sites and applications. Public information is not available on the API; interested parties are asked to email firstname.lastname@example.org. Once available the APIs will "make it possible for people to interact around any topic imaginable."
Stream.io provides developers with tools for adding scalable feeds, activity streams, and chat functionality to their applications via the Stream API. The company has recently announced a new SDK that aims to streamline the addition/creation of chat functionality for iOS applications.