Art takes effort!
*Takes a walk through the Tate Modern*
I'm with GodForsakenBastard on this one. Whilst there are many people who take screenshots that took no effort at all, there are those out there who actually do take their time just like a photographer would in real life. It may be easier because unlike in real life you can pause, but then once again I could bring up digital art and the use of programs like Photoshop. In real life you don't have a undo function, as well as the plethora of other tools, but does that make the picture drawn any less of an art piece? No.
An example of what isn't art? This stamp.