About 80 percent of the photos on Flickr are public and searchable by everyone. In one sense, it's a place where people upload snapshots from the family reunion, wedding or the birth of a baby or something like that, but it's also a place where people go to show what the world looks like to them.

A lot of things have changed since the days of Flickr. Facebook has concentrated the sociality of the Internet within its blue borders, like a Walmart siphoning off the mom-and-pop shops that formerly comprised the Internet's gathering places. Communication, in the age of mobile dominance, has become, of necessity, shorter and snack-sized.