No.
Ignoring them would be wise. Zimmerman was indeed charged with second-degree murder, but he has not been convicted. He will not even be going to trial until June 2013.
https://twitter.com/StateCheckZnEBT/status/268490102899085312
Earlier this year, Twitter erupted with unfounded rumors of Zimmerman’s conviction and sentencing. Today, those false rumors have returned and are running rampant:
https://twitter.com/johnnyBxx/status/268476707307139073
https://twitter.com/LipsmackinqGood/status/268429713075232769
https://twitter.com/BossManIAm/status/268421401273331712
(Hat tip: DavidC99)
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