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Sheryl Sandberg's right! We've teased Facebook's overserious COO for talking up Facebook's need to sign up more users before figuring out how it's going to make billions of dollars off of them. But analytics firm eMarketer says only 42 percent of the Internet-using world knows about social networks. Translation: A lucky 58 percent are not burdened with worrying about whether they've made anybody's top friends list. Heck, while we're at it: Less than a quarter of the world's 6.6 billion people have access to the Internet. That means 5.97 billion people have no reason to have ever heard of Sandberg, let alone blame her for global warming, violence in the Middle East, and cat allergies. Not yet, anyway.