College football player Manti T'eo was the victim of an elaborate hoax by an online "girlfriend" who turned out to be a fake. Of course, humans have always lied in myriad ways and degrees. But are we living in a web-enabled culture of deceit? That's the question "20/20? asks tonight. Tune in at 10 p.m. ET and join the conversation by taking the online ballot below.

Have You Ever Lied About Your Identity Online?