These are some case studies that we found to be useful for Internet Ethics.
Software Engineering Ethics in a Digital World by Awais Rashid, John Weckert and Richard Lucas
discusses the benefits and also disadvantages such as the potential for ethical issues including topics such as privacy, monitoring, data protection, etc. surrounding Web 2.0 and social networking. He describes this through the concept of dual-use dilemma that arises as a consequence of the fact that the same piece of scientific research sometime has the potential to be used for harm as well as for good.
Here is a direct link to the Yahoo! case study
This is a case study on an event where students were allowed access into Harvard’s acceptance records, and the ethics behind it.