Facebook is now a billion-user strong. Mark Zuckerberg, CEO and co-founder of the company, has announced the milestone on his Facebook profile, "This morning, there are more than one billion people using Facebook actively each month. If you're reading this: thank you for giving me and my little team the honour of serving you," .
The world's largest social networking service was founded eight years ago in 2004 in Mark Zuckerberg's Harvard University dorm room. Headquartered in Menlo Park, California, Facebook employs about 4000 people in 19 different countries across the world, including Hyderabad in India.