Librarians know that we must maintain the privacy of library patrons. There is an interesting article in the Chronicle of Education today titled "As Libraries Go Digital, Sharing of Data Is at Odds With Tradition of Privacy". It reports that Harvard University libraries had to stop tweeting about what books their patrons were checking out. . According to the story, "It seemed harmless enough—a typical tweet read, 'Reconstructing American Law by Bruce A. Ackerman,' with a link to the book's library catalog entry". Nonetheless, privacy concerns were raised and they had to stop the tweeting; the worry was that someone might somehow use other details to identify the borrowers.