The complicated relationship between founders of a startup. Billy Chasen and Seth Goldstein lead, but with very different viewpoints on how to succeed:

“Then traffic started falling. By autumn, it dwindled to less than half its peak, and the very same tech watchers started wondering whether it was all over. Goldstein says he can hear the doubt in the voices of his Silicon Valley friends. ‘I can tell now when people say, “How’s it going?” they mean, “You’re flattening, aren’t you?” ‘

“Chasen and Goldstein agree the music fans are still out there (music site Pandora has 49 million active users, Spotify 17 million). Their disagreement over the answer to the obvious question—how to get them back—has created a rift between them that has influenced both their partnership and the direction of the company. In some ways, it’s a classic split between product and marketing. But their predicament highlights what’s so weird about the social-media business: Nobody understands why certain sites grow, exactly. Yet whether or not Turntable takes off again will determine whether it is worth billions or practically nothing. And with no causal data, all that remains is buzz, conjecture, and gossip—the How’s it going?