WordPress 3.6 introduced the Heartbeat API. It’s an exciting API that opens up a whole bunch of possibilities for various core features or plugins, or even themes, to utilize. Pippin Williamson gives a nice introduction and example use case for the Heartbeat API, and Stephen Harris has also completed a three part series for wpTuts+ for using the Heartbeat API. Both are good reads if you’d like to see how to use this new tool for your projects.
