A tag inserted automatically by a host when the image is saved. For example, on the left side we see "FUNsubstance" which FS automagically added. Stock photos also have this, that ghost of a letter across its pictures. They also don't have to be ghost letters in the middle, they can be tags such as a picture from 9 g a g or i f u n n y having a little bar on the bottom of the picture.
I love how it mentioned Jane Dough and John Dough! (which is a reference to what the police and detectives call unknown bodies; Jane Doe for a female, John Doe for a male)
Eheheheheheheh