Jean M. Twenge, an associate professor of psychology at San Diego State University, says gadgets and online social-networking sites have stoked the self-loving tendencies of modern students. Twenge revealed her findings from a study that describes this wired and coddled generation, known as Millennials, as the most narcissistic in recent history. Twenge, who conducted the study with four other researchers, defines narcissism as excessive vanity and a sense of entitlement. In their report, the researchers warn that a generation of swollen heads could harm American society. Twenge blames this apparent scourge, in part, on the "self-esteem movement," pushed by parents, educators, and the media--all of whom, she says, have tried too hard to build children's confidence. One prominent researcher scoffs at Twenge's description of today's students. William Strauss, co-author of Millennials Go to College, says her characterizations are harsh, unfair, and unsupported by the data.