Article Photos: Berry Tramel: Bob Stoops to implement a Twitter policy for players

Brandon Williams takes a handoff from Blake Bell during the first day of spring practice at the University of Oklahoma in Norman on Monday, March 21, 2011. Photo by John Clanton, The Oklahoman

Brandon Williams takes a handoff from Blake Bell during the first day of spring practice at the University of Oklahoma in Norman on Monday, March 21, 2011. Photo by John Clanton, The Oklahoman