In light of the new documents that have come out in the George Zimmerman case -- tweets of Zimmerman's brother also making headlines.

Robert Zimmerman took to Twitter to defend his brother, but are his tweets helping his brother's case?

Zimmerman recently tweeted one picture of De'Marquis Elkins, a teen charged with shooting and killing a 1-year-old in Georgia, and Trayvon Martin flipping the middle finger. He compares the two.

@NAACP @benshapiro @NRA Alleged FBpics of 13mo. old Antonio Santiago's alleged killer & #TrayvonMartin #uncanny pic.

Then he tweeted another comparison picture:

Is this a valid comparison to make? Is it b/c both were "white" men? Why wasn't it controversial/"racist" or bizarre?

George Zimmerman is to the left. The man to the right is Michael Dunn, of Satellite Beach, accused of gunning down 17-year-old Jordan Davis in a gas station parking lot back in November.

We talked with social media expert Tony Tate to find out why people often use Twitter in this fashion and, from a social media standpoint, could it help or hurt?

"I always tell people a couple of things," said Tony Tate. "When there's emotion, really good or really bad emotions stay away, from social media. You always want to know when you put something out there it's out there -- you can't get it back."

We asked Robert Zimmerman if he would comment on his recent tweets. He said he would later this week.