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We already knew that before Facebook hired Google ad boss Sheryl Sandberg as COO in early 2008, Facebook founder Mark Zuckerberg interviewed former eBay executive Jeff Jordan for the gig in 2007. What we didn't know, until a source familiar with Facebook told us, is that Zuckerberg actually offered Jordan the job. Jordan turned the offer down and took over as CEO at OpenTable instead. Why was Jordan so comfortable spurning a pre-IPO social network gaining users at a rate of 3 percent a week? Our source says the infamous workaholic blamed it on Zuckerberg's propensity to sleep-in. "It was a cultural thing," our source says. "Jeff has two kids and needs to keep a regular schedule. Mark doesn't show up at the office till 11."