Art teachers often tell students to document by sketching rather than by taking photos. Snapping an image can be a lazy, visually uninvolved way of registering a situation of interest. For me that's the lamentable phenomenon here. I'm not sure about the relevance of Susan Sontag's thought -- it seems like the selfie stick nonsense is a more superficial and trivial kind of digital self-indulgence than she probably imagined.