Americans are now spending more time on social networking sites than on all other sites combined. Facebook alone has more than 1 billion users — that’s 15% of the world’s population and almost 50% of internet users, and they spend an average 15 minutes a day on the site. And that’s just one site; imagine if you added in Twitter, LinkedIn, Google+, Weibo, Renren, Orkut, and on down the list.