Consider this bit from blogger Seth Goldstein:
It is as if in a matter of months, both the high end of LinkedIn and the high-end of MySpace had been absorbed into the Facebook social graph. LinkedIn is suddenly no longer the social network of choice for us chic geeks. Yes, we learned how to tell our professional stories these past few years in the LinkedIn profile fields, but- as in summer of our 8th grade- we are now ready to lose the awkward friends we had accumulated , and start from scratch in a new environment.
Meanwhile, the kids who treated their MySpace profile, and concomitant friend requests, with the same reckless abandon that we have done with our LinkedIn profiles, have now de-camped for Facebook.
Is it just me, or is there a strange similarity between all these social networking sites and say, areas of a city that get hot with all sorts of bars and nightclubs and then go cold in a matter of months? I mean, Friendster was huge, then it wasn’t. LinkedIn got big, MySpace got big, and now Facebook seems to be getting big. Someday, Facebook will be cold, too. Just like neighborhoods or nightclubs.