It's true and well know that twitter don't make much money and have problems generating money but Youtube have never made a profit. Their bandwidth and storage costs are huge and Google only pumps money into it to get info on what people like to watch and view. Facebook only recently started making money after years and millions of dollars of investment. I wouldn't worry too much about Twitter not making money. With such huge market dominance it's only a matter of time before they find a solution that works.