(Graphic art by Oma Studios) Two fatal shootings in Minneapolis this January didn’t just take lives. They set off protests, political firestorms and a blitz of online narratives racing ahead of the facts.  Almost immediately, videos, tweets and posts shaped what people believed had happened.  On Jan. 7, Renée Good was shot and killed by a federal immigration agent during an enforcement operation. On Jan. 24, Alex Jeffrey Pretti, a 37-year-old intensive care nurse for the U.S.