When trying to make sense of the changes that new media have brought to us, we can use either supplementary or substitutionary logic. With supplementary logic, Facebook et al. extend the range of our embodied relationships; with substitutionary logic, social media replace them. Those who want to use social media to enhance their churches' outreach implicitly use supplementary logic. Those who want to worship online and don't want to change out of their pajamas or meet other people in their messy particularity ... well, you get the idea.
A recent trip to New York City for a first meeting of the New Media Project Research Fellows reminded me of the superiority of supplementary to substitutionary logic. This happened because the neighborhood around Union Theological Seminary is so deliciously, specifically, embodiedly particular. Union itself is a marvel: its gothic architecture makes it unmistakable that this is a place with history. Niebuhr taught here; Bonhoeffer smoked and worried and decided to go home here; James Cone and Christopher Morse teach here; Serene Jones leads here. The neighborhood extends this particularity; the Jewish Theological Seminary, down Seminary Row, has a glorious crest above its door: "And the bush was not consumed." A tunnel under Union leads you to the grandeur of Riverside Church, where Fosdick and Forbes thundered. Go a few blocks south and east, and you're at The Cathedral of St. John the Divine, the largest interior church space in North America. The morning I visited, the light shone blue through the rose window, filling the clerestory with incandescent beauty. The chapel at Columbia University, with its stained glass above the altar depicting St. Paul preaching on Mars Hill, is a perfect image for situated Christian truth vis-à-vis the gods on campuses and in Manhattan.