According to Health Day News:
New research suggests that people are more likely to lie to strangers when they're communicating via email or instant messages rather than when they are talking face-to-face.
"It's not news that we lie. What's new is that we lie even more online," said study author Mattitiyahu Zimbler, a graduate student and senior researcher at the University of Massachusetts-Amherst. READ MORE 
Does this suprise you? Why do you think people lie more online?