Private social network platform Yammer added a developer portal to support its Yammer API. Yammer has had an open API for some time, along with community features such as a developer blog, but the site reorganization prepares Yammer for a growing developer community with new must-have features.
Perhaps your most important online network of business contacts is now programmable. LinkedIn launched its API (our LinkedIn API profile), which allows developers to access a user's connections and anyone's profile data, in addition to several other features. Though some are saying "finally," it's clearly not too late for LinkedIn, who aims to be the professional networking platform.