As soon as the enormity of Wednesday’s tragedy at Charleston’s Emanuel AME Church became apparent, surviving members of the congregation and residents of South Carolina’s “Holy City” quickly turned to prayer. The first vigil formed that night near the scene of the shooting, a church of profound importance to African-American civil rights movements even before the Civil War. “We’re always going to be free,” one of its leaders asked, “but where do we go from here?” Meanwhile, across the country, Americans took to social media to join in observance. Here, a sample of the tweets posted under the hashtags #Charleston and #PrayforCharleston.