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Shortly after the verdict was handed down, Associated Press reporter Cristina Silva tweeted, “So we can all kill teenagers now? Just checking.” She quickly deleted the tweet and appears to have removed her Twitter account.

Democratic strategist Cornell Belcher, a CNN contributor, also issued a controversial tweet.

Zimmerman was innocent the moment they sat an all-white jury,” he said, referring inaccurately to the six women who decided the defendant’s fate, only five of whom were white, according to courtroom observers.

The media also came under fire from the Zimmerman team at the weekend, accusing the reporting on the case of fanning racial flames and smearing Mr. Zimmerman to the point where he cannot even live a normal life after his acquittal. For example, NBC edited a 911 audiotape to make it seem as if Mr. Zimmerman had racially profiled Trayvon, when he was responding to a question from the police dispatcher.

“He’s going to be looking over his shoulder the rest of his life,” brother Robert Zimmerman Jr. said during an interview on CNN.

Social media Saturday night and Sunday were filled with threats against Mr. Zimmerman, perhaps most notably NFL star Victor Cruz, who tweeted that “Zimmerman doesn’t last a year before the hood catches up to him.” Comedian Kevin Hart gave him less than that by saying, “I give Zimmerman a week” and that Mr. Zimmerman “better be good at playing hide and seek like Bin Laden.”

“There still is a fringe element that wants revenge,” said defense attorney Mark O’Mara, who noted since last summer that Mr. Zimmerman and his wife had been living like hermits because of fear for their lives. “They won’t listen to a verdict of not guilty.”

Such reactions are hardly surprising, given the racial backdrop and emotionally charged nature of the case. But analysts say now isn’t the time for more anger.

“I believe that people, like me, who are saddened that there was not at least a guilty verdict on manslaughter will spend some time reflecting and then using their energy for positive change and reconciliation,” said Montre Carodine, a law professor at the University of Alabama Law School who specializes in U.S. race relations. “I think that most people can agree that Trayvon Martin’s death was a tragedy. And many people see this not as a time to riot but as a time to … address broader societal issues that cause persistent racial disparities.”