Photographing your food

Not sure what I think about this. Truly a digitally enabled phenomenon–who would develop all of those pictures, and where would they have collected them, otherwise? But so many other considerations here–like, is this rude to surrounding diners? Is this a great way to help control your food intake? Is it just a nice hobby? I write all this as someone who has, at intervals, photographed particular dishes, and particular cocktails, if not particular servings.