Final Foolish thoughts If Facebook's recent stock price slide isn't due to Sandberg's insider selling, that brings us back to square one: Is Facebook taking on too much, too soon in an effort to become the next Google? As a longtime Facebook bull, I still believe its outstanding financials and rocketlike growth warrant investor optimism. But it's time for Zuckerberg to rein it in. Facebook isn't Google, and it shouldn't try to be. Unless, of course, Facebook is focused on stealing digital advertising market share from its chief rival.