It’s difficult to imagine a world without Facebook, but the social networking site celebrates its 10-year anniversary this week. That means it’s been a decade of friending, un-friending, photo-tagging, poking (remember that?), status-updating and ex-stalking. The site has come a long way in 10 years, from its humble beginnings as a network of college students to a multi-billion-dollar powerhouse with more than a billion users worldwide. In the last decade, we’ve followed Facebook’s milestones and scandals in the news and used its data to learn about our own society. Founder Mark Zuckerberg- a Harvard dropout who invented the site in his dorm room- always said his vision was for Facebook to connect the world. For better or for worse, we’d say it’s done just that.