AdvertisementSocial Media Put Fla. Case In National SpotlightMarch 21, 2012Karen Grigsby BatesfacebookEmailCivil rights leaders and residents of Sanford, Fla., attend a meeting Tuesday to discuss the death of Trayvon Martin, who was shot by a neighborhood watch captain. The Justice Department and the FBI opened an investigation into the shooting, and the local state attorney announced that he had asked a grand jury to investigate. (Getty Images)