The GBI has arrested a man after a post on social media apparently threatening people protesting the shooting death of Ahmaud Arbery has caught the eye of investigators. The GBI tweeted Sunday that it is investigating a Facebook post that contains a threat to future protests connected to Arbery, who would have turned 26 on Friday, but was shot and killed Feb. 23. On Sunday night, the agency said it had arrested Rashawn Smith, 20, and charged him with dissemination of information relating to terroristic acts. He was taken into custody in Midway, Ga. Police said he created a Facebook...