How do you know if you're already addicted or rapidly tumbling toward trouble? The Internet Addiction Test is the first validated and reliable measure of addictive use of the Internet.
Here's a handy one screen Tag Cloud of Web 2.0 terms from the Wikipedia entry on that topic. Many of the terms are clickable to the entry on that heading. Good for use after exploring Web 2 applications to see if there's any jargon that still wants clarification.
In the project's first position paper, "Developing Minds and Digital Media: Habits of Mind
in the YouTube Era" (http://www.pz.harvard.edu/eBookstore/PDFs/GoodWork51.pdf),
authors Margaret Weigel and Katie Heikinnen have synthesized the leading theories of
cognitive development (Piaget, Vygotsky, Bruner, Erikson), education and media studies
(Turkle, Papert, Jenkins), and empirical findings about young people's digital media.