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In October 2017, Presbyterians will celebrate the 500th anniversary of a pre-digital tweet storm: Martin Luther’s 95 Theses. The theses, which criticized the sale of indulgences by church officials, are considered the opening salvo in the Protestant Reformation, a movement that emphasized individual relationships with God and salvation through faith alone.

Luther was an early adapter of the printing press—the social media of the sixteenth century—and the most widely shared writer of his...