Jean Baudrillard

Baudrillard was French sociologist, philosopher, cultural theorist, and his work was frequently associated with postmodernism. He believed in hyper-reality and that there is no truth. For example Disney Land is presented as imaginary to make us believe the rest is real, whereas LA is no longer real and belongs to hyper-real order and to the order of stimulation.
He also believed in 'Simulacra' - when a sign loses it's relation to reality, it then begins to simulate a simulation or 'simulation' - when a representation of something comes to replace the thing which is actually being represented.

Some of his quotes:
“We live in a world where there is more and more information, and less and less meaning.” 

“There is nothing more mysterious than a TV set left on in an empty room. It is even stranger than a man talking to himself or a woman standing dreaming at her stove. It is as if another planet is communicating with you.” 

“The secret of theory is that truth does not exist.”