I think niftich's reasoning was chicken and egg. No one (practically speaking) accepts micropayments because there's no unified system with good UX, and no one

I think niftich's reasoning was chicken and egg. No one (practically speaking) accepts micropayments because there's no unified system with good UX, and no one can build a unified system with a good UX because no one is accepting micropayments. Facebook could change all that in the same way that MS can push a feature to Windows and instantly make a new market. Barrier to entry looks different when you're a de facto monopoly.