Sometimes you have to dig a little deeper into what's being photographed. Most subjects will take front and center of the photo. Subjects placed "off to the side" sometimes can appear staged. Thus, you should make certain to read the photo caption. A person who has innocently captured a real ghost probably didn't think they were going to photograph one that day. In such cases, the subject of the picture will be immediately present itself. Check for group pics of happy smiling people holding beers and making funny faces. Then look in the background for weird things...subtle things. These details should definitely be pointed out in the photo's description.
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