［l］Internet use appears to cause a decline in psychological well-being， according to research at Carnegie Mellon University.
[2] Even people who spent just a few hours a week on the Internet experienced more depression and loneliness than those who logged on
less frequently，the two-year study showed. And it wasn’t that people who were already feeling bad spent more time on the Internet， but that using the Internet actually appeared to cause the bad feelings.
[3]Researchers are puzzling over the results， which were ， since the Internet allows users to choose their information and to communicate with others freely.. They expected that the Internet would prove socially healthier than television
