We photograph because that’s what one does - sometimes for the sake of having the photograph, of having something we look at later or of having something we can display so other people can look at it later, but oftentimes simply to have photographed. There are billions and billions of photographs on Facebook and on other websites now that will never be looked at again. This makes no sense - unless the photographs themselves are not what matter here.
And that, I believe, is what has happened over the past few years: The act of photographing, the gesture, has become part of our interaction with the world. You photograph just like you look. You know that you can never look at all of those photographs again (in all likelihood you never will - who has the time?), but it’s not about the photographs - it’s about the photographing. The act of photography might have turned into the equivalent of whistling a song, something you do, something that might or might not have beauty, a communicative act just as much as an affirmative act: I was there, and me being there means I had to photograph it.