The social networking mogul shared his experience in a talk at Startup School, the annual conference for entrepreneurs and computer hackers at Stanford University, the Daily Mail reported Monday.
Even though Facebook boasts one billion users worldwide - the founder divulged that he most likely would have made his way to Seattle if his idea had flopped.
"I probably would have taken an engineering job (and) always had a lot of respect for Microsoft," he told Paul Graham, co-founder of the tech venture capital Y Combinator, during an interview Saturday before an audience of 1,700 at Stanford's Memorial Hall.
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