Did you just tweet or post to Facebook before reading this paragraph? That's what millions of Americans are doing with their phone, tablet or laptop at any second of the day. And that activity is not lost on automakers. All of them have some sort of social media presence. Today on Autoline This Week John McElroy is joined by Mary Henige from GM, Ford's Scott Monty and Ed Garsten of Chrysler to talk about what their companies are doing in the social media universe.