These days, social responsibility is regarded as a vital ingredient in a quarter-pounder.

BBC: Volunteers v corporates at the Olympics

And yet the Big Mac remains the most popular sandwich in the world, and the quarter-pounder with cheese is not far behind it.

ECONOMIST: As hamburgers go, so goes America?

That there looks like you've got a quarter-pounder, man.

NPR: A Trip On The Pineapple Express

Constant reminders that a juicy quarter-pounder was once a wobbly-legged, big-eyed calf may put some people "in the mood to have a steak, " said Michael Pollan, who has written several books critical of modern beef production.

WSJ: Beef Industry Carves a Course