Marjory Stoneman Douglas High School senior David Hogg, who survived a mass shooting that killed 17 at his Florida high school, is calling for a boycott of two of what he says are the biggest investors in gun manufacturers: BlackRock and The Vanguard Group. Hogg used the hashtags #BoycottVanguard and #BoycottBlackrock in a Tuesday tweet. Read the original story from The Associated Press.