Mind-boggling figures aside, the question on many minds is this: Is Mr. Zuckerberg really ready for this? Is he — there’s no sugarcoating it — grown up enough to lead a public corporation that is more valuable than McDonald’s or Goldman Sachs? The answer to those questions will determine the future of Facebook, as well as the fortunes of its new, public shareholders. For the first time, Mr. Zuckerberg will be judged, in real time, by a relentless stock market. And that market, as C.E.O.’s everywhere know, is merciless.

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