It's quite obvious: this picture is a screenshot from a video.
The aspect ratio of the picture is a perfect 4:3 ratio, in addition this would explain the absence of EXIF data. (I just tested this theory, by Print-Screening my desktop and saving it as a JPEG in Photoshop. When I then opened the file and looked at the EXIF data, it was empty, just like this clue.)
Also, if you look at the picture it looks like a captured frame from a rendered animation/Flash video that was shrunk down to minimize the graininess from the video compression.
