Interesting concept you have there but I again don't see much of a relation in comparing Bitcoin to fb 
Facebook has no inherent value. The only way Facebook has value is if people accept it as a way to interact with others. It is just a bunch of ones and zeros that cannot be used as jewelry and is not backed by the full faith and credit of the government.
Yet it has value because people use it, it has reached the point where the network effect has created such value.
If Bitcoin were to have as many users as Facebook the value would certainly be justified. But Facebook is a social tool, Bitcoin is a currency which has more economic value so it would likely be worth much more with the same amount of users.
