Business social network LinkedIn has launched an investigation into a breach of as many as six million user passwords that may have been published on a hacker's website. According to an official LinkedIn update, users will "benefit from the enhanced security we just recently put in place..." Ireland's data protection authority said it may investigate the incident, and U.S. lawmakers are calling for data security legislation. The University of Virginia and eHarmony also had systems breached this week. Meanwhile, The New York Times reports on findings by security researchers revealing that LinkedIn's mobile app may transmit iPhone and iPad calendar details back to company servers without user knowledge. The practice, the report states, may violate Apple's privacy guidelines. A LinkedIn spokeswoman said the "calendar sync feature is a clear 'opt-in' experience." (Registration may be required to access this story.)
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