Snap, snap, snap. Every two minutes we take as many photos as were taken in the entire 19th century. Ten percent of all photographs ever taken were shot in a recent twelve-month period. That's the result of some careful calculations by the 1000 memories blog. Even if the startling statistic is off by a few million photos, it's still clear that the digital age – and the omnipresence of digital cameras and cell phones – has unleashed an unprecedented surge in picture taking and posting. Facebook, Instagram, Flickr…. Are we in the midst of a visual feast or a visual glut? Vicki Goldberg writes about art and photography for the New York Times and other publications. Her latest book is The White House: The President's Home in Photography and History.