The Trayvon Martin case has exposed some of the media's worst tendencies--selective editing, rushing to judgment, stoking anger for ratings and page views--and it's taken more than fake photos, the incendiary stumbles of Geraldo Rivera and Spike Lee and verbal clashes between Piers Morgan and Toure to shine a light on them.

Here are three recent, troubling examples:

1. After ABC News aired surveillance video of George Zimmerman, Martin's shooter, entering a police precinct without any apparent injuries, the Daily Caller treated the tape like a Zapruder film, enhancing still images from the video and concluding that it found "what may be an injury to the back of his head." The site's photo "analysis" of the back of Zimmerman's head--replete with yellow Photoshopped arrows--"indicates what appears to be a vertical laceration or scar several inches long."

Keep in mind, this is the same Daily Caller that published 152 pages of what the conservative site claims were Martin's tweets--which, if they were, prove that Martin was a pretty typical high school male, preoccupied with girls, sex and getting out of class early.

2. NBC told the Washington Post that it has launched an internal investigation of the "Today" show's editorial process after its morning show aired an edited conversation between George Zimmerman and a 911 dispatcher recorded moments before the shooting. The investigation came after Fox News and others pointed out that the network spliced two parts of the call together, making it appear as if Zimmerman had said, "This guy looks like he's up to no good. He looks black." In reality, Zimmerman was answering a dispatcher's question: