While I was off the grid, Cory Doctorow created a law of social network sites and named it after me:
boyd's law: "Adding more users to a social network [site] increases the probability that it will put you in an awkward social circumstance."
This comes from a brilliant column that he wrote for InformationWeek about how the Facebook communication technology (combined with their not-so-open platform strategy) resemble AOL's old segregation/segmentation approach to users. (Remember the days when AOL users couldn't email anyone who didn't have an AOL account?) Embedded in this discussion is a concern for how social network sites are extremely socially awkward. My favorite quote: "It's socially awkward to refuse to add someone to your friends list -- but removing someone from your friend-list is practically a declaration of war. The least-awkward way to get back to a friends list with nothing but friends on it is to reboot: create a new identity on a new system."
Boyd's law of social network sites - Marketing & Strategy Innovation Blog