In general (again as a newbie), when talking about "art" in a photography context (and not good vs bad art), I think the definition is much more lax but easier defined than other forms of visual art. In my mind, it comes down to the thought process a photographer goes through to create the picture. Are they capturing a moment only to document it? Most people take pictures this way. Snap a picture of your kid blowing out candles so you remember and post it on Facebook. Or are they capturing a moment and trying to make it look interesting, beautiful, etc? Fewer people do this. Turn down the lights, get a tripod, and capture the moment of your kid blowing out the candles. Not saying there's any requirement for fancy equipment or time, just as long as the photographer is attempting to make the moment "beautiful" (subjectively) rather than simply documenting it. I think most people who take the time to join this forum and post their pictures fit into the later almost by default. Facebook is for the former. But that's just me!