The document discusses how photos are more engaging than text for online content. It notes that over 10% of all photos ever taken were within the last 12 months, due to the rise of photo-enabled devices. While professional photos were traditionally used, user-generated photos now often get more attention (e.g. Charlie Bit My Finger video). The document advocates using photos to boost engagement by making content more social, navigable, interactive and shoppable, and targeting ads better.