According to the Norton Cybercrime Report: "The Human Impact", more than a quarter of people online have lied about their name.
(In addition more than one in five people have done something online they regret. Many felt it was "legal" to download a music track, album, or film without paying (17%, 14% and 15% respectively), while 17% viewed plagiarism as an acceptable practice, and nearly a third had e-mailed or posted pictures of someone else without permission, a quarter had secretly viewed someone else's browsing history. So, which one have you done?)