Facebook now commands more than 800 million active users, adding more than 200 million of those in the last year alone. Twitter now boasts 100 million active users, about a fifth of whom are in the USA. LinkedIn has 64 million users in North America alone, and used this tally to launch a successful IPO back in May. Moreover, these social platforms also now play a major role in the way that we receive and share news, as well as becoming an important, on-the-spot source of news themselves. Internet marketing firm Dream Systems Media took data provided by AdAge and converted the numbers into infographic, which takes a closer looker at today's social media statistics.