Since MIT and Harvard started edX, their joint experiment with free online courses, the venture has attracted enormous attention for opening the ivory tower to the world. But in the process, the world will become part of an expensive and ambitious experiment testing some of the most interesting--and difficult--questions in digital education. Can…

Colleges share many things on Twitter, but one topic can be risky to broach: the reading habits of library patrons. Patrons' privacy is precious to most librarians. Yet new Web services thrive on collecting and sharing the very information that has long been protected. This points to an emerging tension as libraries embrace digital services.…