"For adoption of new technologies in science, it has to be an order of magnitude more useful than current tools. We just don’t have the time to waste learning new tools that only marginally increase our productivity." Discussion: http://friendfeed.com/science-2-0/bceaea67/scientists-still-not-joining-social-networks
The recently released ECAR Study of Undergraduate Students and Information Technology gives some excellent insights into trends in college students' technology ownership, perceptions, skills, and habits.