As we all know, Donald Trump's tweets have become a potent force in our new era. On the one hand, a single tweet can cripple opponents, activate supporters, move markets, and subsume the news cycle. On the other, they're a window into Trump's wee-hours, unfiltered id.

This hour on Focus, we’ll talk about the media coverage of the Boston Marathon Bombing with Bob Garfield of On the Media and Professor Brant Houston of the University of Illinois College of Media.