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Researchers have come up with a new use for the ubiquitous mobile phone: tracking human movements. By monitoring the signals from 100,000 mobile-phone users sending and receiving calls and text messages, a team from Northeastern University in Boston, Massachusetts, has worked out some apparently universal laws of human motion.

Interesting comments about the ethics of research methods that use mobile phone data without consent of the users.

This is the first textbook on the central ethical issues of digital media, ranging from computers and the Internet to mobile phones. It is also the first book of its kind to consider these issues from a global perspective, introducing ethical theories from multiple cultures.