The bakery has grown sevenfold since then--mostly on Bell's watch.

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Pacific Time on Friday, hundreds more employees returned to the campus to watch Mr. Zuckerberg ring in Nasdaq's opening bell.

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But if a family is concerned, when you're actually trick-or-treating, if you watch your child go to someone's door, ring the bell, and the other family comes to the door and hands them candy, it's one way of knowing it's a safe and comfortable gift of the candy.

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