Higher education is using twitter to "help the students feel more like a community, and break down that barrier between inside the classroom walls and outside the classroom walls."
Great article about social networking sites like facebook and myspace - now that "grown-ups" belong, they need to know the implications. Very detailed explanations.
Library of Congress collections are amazing primary resources for the study of history. It's so cool that mainstream social networking users get to participate in tagging the collections.