Link to April 26 ABC News report, "Deactivated: College Students Giving up Facebook...By Choice".
Apparently, Lauren McGaha based this report on two interviews with college students. At least that's all the evidence she offers.
Link to February 3, 2010, Pew Internet & American Life Project report, "Social Media and Young Adults".
Excerpt: New survey results also show that among adults 18 and older, Facebook has taken over as the social network of choice; 73% of adult profile owners use Facebook, 48% have a profile on MySpace and 14% use LinkedIn. “Blogging appears to have lost its luster for many young users,” said Lenhart. “The fad stage is over for teens and young adults and the move to Facebook -- which lacks a specific tool for blogging within the network -- may have contributed to the decline of blogging among young adults and teens.”
Retiring Guy's not saying that things can't change quickly in this wireless world but a couple of anecdotes do not build a convincing case.