Houston’s Memorial Hermann hospital plans to Tweet live updates of a brain tumor resection, Wednesday, May 9, 2012 beginning 8:30 a.m. EST. The brain surgery will be performed by Dr. Dong Kim, a neurosurgeon who helped lead the team that treated former congresswoman Gabrielle Giffords after she was shot in the head in 2011. Dr. Kim said, “Social media is a very powerful communications...