I guess they have nowhere as much, but it's probably good for marketing purposes. In my social environment probably 25-30% of the people are on facebook. And I

I guess they have nowhere as much, but it's probably good for marketing purposes. In my social environment probably 25-30% of the people are on facebook. And I guess that's still way above the average - because of age (the percentage of > 50 year olds will be much less) and region (in less developed countries less people will have the chance to use facebook). In total I would expect less than 10% of the world population to use Facebook, but even that would be massive.