Facebook CEO Mark Zuckerberg does not think small. "Big" doesn't do his objectives justice, either. At the Cannes Lions International Advertising Festival today, Zuckerberg talked about getting 1 billion users and making his site the top social network in every country in the world. Facebook isn't as far away from achieving that second goal as some people might imagine. According to Mark Sweney , Zuckerberg shared an interesting piece of information by stating,