According to Gizmodo.com, here are some of the big lies people tell in online dating:

"I'm 6 feet tall." 
REALITY: People are two inches shorter in real life.

"I make $100,000 a year." 
REALITY: People are 20% poorer than they say they are.

"Here's a recent pic." 
REALITY: The more attractive the picture, the more likely it is to be out-of-date.