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Many of the most successful founders are introverts. Mark Zuckerberg, Larry Page, Bill Gates, none of them are very extroverted, but they've started some of the most valuable companies in the world. Of course if you are so introverted that you are unable to make eye contact or talk to people it will be a problem, but most of us are not that extreme. |
He made it exclusive. You had to have a .edu address to sign up so the people ON the network were initially only your peer group. You couldn't get in without that .edu address and therefore you WANTED to get in if you couldn't.
This created a steady user base that didn't have to be EVERYBODY (as long as people at your school were on you didn't care) and a natural spam filter as there were controls on access to those email addresses. Once those people graduated from college they got to stay on the site.
Zuckerberg succeeded specifically because of the exclusivity that Facebook grew from during a time where every other service was just a spam mine.