Cyber Truths

The internet gives you the opportunity to be really honest, with no repercussions. You can do and say whatever you feel, and it doesn't matter if people disagree, because their opinions can't effect your life. What i wonder is, why then do people use the internet to lie? When you have the chance to be yourself, be whoever you've always wanted to be, why do people think it is better to lie to strangers than it is to tell them the truth?