“What it doesn’t reflect is where Facebook will be 5 or 10 years from now. I could easily make a bullish case for Facebook — with its 900 million users, and its wise-beyond-his-years chief executive. I could just as easily make a bearish case: Maybe Facebook will never figure out mobile. Maybe its moment will pass before it ever becomes the kind of technology juggernaut that Microsoft once was, or Google is. But being either bullish or bearish requires making a judgment that is years away from being revealed.”