We're building a learning community for hackers & founders by organizing local study groups on technology and entrepreneurship around the free online university classes provided this spring by Stanford, Berkley, MIT, Udacity, Coursera, and others. This is the start of an era of massive open online learning. In fall 2011, Stanford University offered a free online class in Artificial Intelligence. 160 thousand students from 190 countries enrolled, with more than 23 thousand completing the class. N …