Valuing Social Networks For Fun And Profit – The Source – WSJ
But the difficult question that Twitter poses — how the big user bases of free Internet services can be converted into revenue — may also be put to Facebook and LinkedIn.

Valuing Social Networks For Fun And Profit – The Source – WSJ
But the difficult question that Twitter poses — how the big user bases of free Internet services can be converted into revenue — may also be put to Facebook and LinkedIn.
