I truly doubt Zuckerberg would have been able to convince people from Harvard to use Facebook back in it's inception without being from Harvard himself. Harvard is a seed market because it's Harvard. Podunk state college is not a seed market because people back then would rather have used one of the better existing solutions such as Friendster back then.
The only reason that I and many others joined back then was because of it's exclusivity. We would have used Friendster, Livejournal, or maybe even joined Myspace for the sake of a superior product.I am quite confident that Facebook would have died in it's infancy had it been created in some state college.
The whole exclusivity in the beginning was the sole reason that it was able to make it this far.