The filing for Twitter's pending public offering lacks the bombast and boundary-stretching of filings by tech companies such as Groupon, Zynga and Facebook, Steven Davidoff writes. That's a sign of Twitter's maturity, and should appeal to investors seeking a solid, reliable bet. "The future billionaires of Silicon Valley may want to pay attention. Humility and diligence can sometimes work wonders for your I.P.O.," Davidoff writes.

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