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? Read More
