[dingo_bat]

I do not see any proof that such a correlation does not exist. Your link contains an offhand remark that does not cite any study or data. I think it's common sense that if you offer something for free, more people will use it.

[slaxman]

It's not common sense. A good example is the vast number of open source projects that are never used. Or free books that are never read. Also, I would like to remind you that, it's not the internet that facebook is giving access to. It's sites that have paid facebook to be on it.