True, and one cannot even trust the pictures they post, for even their truth is a lie. A good example of the necessary logic comes from the old joke:
Two competing merchants, X and Y, meet on the road. X thinks, "he's a competitor. The last thing I need is to have him around to ruin my transactions. So if he asks me where I'm going, to A or to B, I'm not to tell him the truth that I'm going to A and should say that I'm going to B instead. But since he would not believe me anyway, I should say that I'm going to A".
Well, they meet, exchange the greetings, and Y asks, "well, and where are you going?"
"You are lying in your teeth, old X, you ARE going to A".