Remember Friendster? Remember Compuserve? Douglas Rushkoff does, and he argues that the current noise about how big Facebook has become obscures an important fact: All social networks fade in time and are replaced by other social networks. (He doesn't use the word "Buddhism" but essentially argues that the Internet provides excellent examples of impermanence. I can remember, as Rushkoff does, when MySpace was considered a big deal.)
Rushkoff's fine new book, Program or Be Programmed: Ten Commands for a Digital Age, also talks about this. My interview with Rushkoff runs tomorrow.