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"The founders say that they would have kept trying much harder at the Facebook component if they knew how huge a similar site would become."

Everyone would be a millionaire with the benefit of hindsight.

Totally, but there's also a good chance the interview went like this:

Reporter: "So knowing what Facebook has become now, would you have stuck with it?"

Founders: "Of course!" (laughter)

Article: "The founders say that they would have kept trying much harder at the Facebook component if they knew how huge a similar site would become."

Everyone sounds more nebbish when translated through a reporter.