The scenario... You've met someone offline. It turns out they are a liar. They are dishonest, blatently lied, misrepresented themselves and you have serious concerns about their intentions. He has admitted to someone else that he lied. Would you warn others in your online community about them? Especially if you talk to these other people quite a bit, but are only "online friends"? Or would you let them met him and find out for themselves?