In honor of Paul McCartney's 70th birthday, here's a look back at the bewildered Twitter response to his recent Grammy appearance. Fifty years ago these people would have been screaming their heads off over Sir Paul as if the first one to lose consciousness from hyperventilation got to have sex with him. Now we live in an age when "Who is Paul McCartney" can be trending on Twitter, made possible by a generation that couldn't identify him unless he did a dance party remix of "Yesterday" with LMFAO. This should invigorate Sir Paul. There's nothing more exciting to someone who thinks he's conquered the world than to find out there are still lands left uncharted. Happy 70th and many more.