Facebook is the social web leader in number of users and at year-end 2011 registered the impressive number of 799 million subscribers worldwide , according to Internet World Stats.

Europe has the largest number of Facebook subscribers in the world, 223 million, and a penetration rate of 27.4 %. Northern America has the largest Facebook Penetration Rate, 50.3 %, indicating that one out of every two persons in America has a Facebook account. 
Facebook users in the world by geographic regions, Q4 2011:
- Europe: 223.4 million (27.4% penetration rate)
- Asia: 183.9 million (4.7%)
- North America: 174.6 million (50.3%)
- South America: 103.3 million
- Central America / Mexico: 38.3 million
- Africa: 37.7 million (3.6%)
- Middle East: 18.2 million (8.4%)
- Oceania / Australia: 13.3 million (37.7%)
- Caribbean: 6.2 million (15.0%)