Bros,
The bait and switch phenomena is so prevalent here in the States, that some hobbyists (i.e. your humble narrator) always does an image search before arranging a meeting. The online ads always show a beautiful girl in a near perfect setting which visually promises the full monty if you've got the money. Being a more astute consumer of the finer things in life leads me to always run an image search first to determine if the posted photo(s) are in fact legit. This has paid off more than once.
For those that are unfamiliar, the user can search some fraction of the web's posted images by using several of the free image search websites. These may or may not return the web locations where the image under consideration can be found. In some cases, the image under consideration may be found on 100's of websites. Obviously it becomes doubtful that it is in fact the provider's photo.
Two of the image search sites I regularly use are:
http://www.tineye.com/
https://www.google.com/ select "Image" function.
Often it is the case that one of the two sites above will return one or more locations where the image is located, while the other will return nothing.
I am interested to learn if there are other image search sites which the bros are using with success.