Obfuscating is the act of twisting words and meanings around so they mean something else than what they were intended for. Lying is making false statements. Both are untrue, but they differ in execution.

A troll often has no option other than to lie in order to further his agenda. Especially when he's lost all arguments.

A good example of this is when Edwin quoted Sandman saying something, using quotation marks. Problem was, that this wasn't something Sandman had ever said. Or when Michael listed five outright lies about Sandman.