It's using this Watson API: http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercloud/user-modeling.html http://www.ibm.com/smarterplanet/us/en/ibmwatson/

It's using this Watson API: http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercloud/user-modeling.html http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercl... and using the sample Node project to show the results. I am still exploring it myself :p