In the wake of the Boston Marathon bombings, a collective force sprang into action. This group gathered to express their grief, to share their memories, and to discuss how to best respond to the tragedy. Up until about 15 years ago, such a group would have gathered in a church or other religious space to perform all of those functions. The primary gathering node for communal coordination for the past three millennia has been religious spaces. But this particular group did not gather in a church. They gathered online—in many online locations but most prominently under a Twitter hashtag: #prayforboston.