Tesla may get an "A" grade for the look of its cars, and the experience of driving one of its vehicles. And when it comes to drumming up publicity, CEO Elon Musk's grades have to be at the top of the class:
What makes you tick, who you know, where you go, even where you might end up. The information you share in your profile is a snippet of what Facebook and its partners really know about you. Kevin Roose, a technology columnist for The Times, explains.