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1.
A person who misrepresents themselves online by using their most flattering picture, by using a picture that is many years out of date, or a combination therein.

Or:

Someone who uses the magic of photoshop to appear good-looking.

see also, "secret ugly"

"I had been talking to her on AIM for months, but when I finally saw her, she was hideous like the elephant man. Total secret ugly."
by Spencer S. April 08, 2003