The Viafoura User Engagement Data Python Sample Code demonstrates how to access the API to implement user engagement features. Developers can end GET requests that will indicate a total number of clicks as a response.
Slack is targeting the enterprise in a big way with Slack Enterprise Grid, a scalable version of its business communications platform. Along with the expanded platform, Slack updated its Node.js and Python SDKs so developers can add the new features to their own Slack business apps.
Hellotxt, the service that lets you simultaneously update your status and read your friends' status across many services, has now released an API. There is a long list of microblogging and social networking sites that Hellotxt interacts with, ranging from Facebook and LinkedIn to of course Twitter and FriendFeed (see their home page below).