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Foursquare, Quora, Path. Each is (or was) a Valley darling; each has millions of loyal users; each has raised more than $50 million, albeit nontraditionally, and been valued at $400 million or more — and each has recently done something remarkable. Foursquare and Path pivoted, hard. Quora, bizarrely, joined Y Combinator. Are they flailing, or is there method to this madness?
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