http://techcrunch.com/2014/07/12/money-at-our-fingertips/

Take special notice of the bits around mobile. Personally, I don't like the idea of having some sort of RFID thing that can be used for purchases or my fingerprint because conversely it can be used to track everything I do, but the average Joe is all too happy to trade freedom for convenience, and I have to keep reminding myself when I think of cryptos my views don't reflect the vast majority's views.

This is all food for thought when we consider where to place our efforts in this platform. I have been banging the mobile drum the whole time and will continue to do so. When you can "bump" your phone with your buddy to get him/her back for the beer they got you or whatever, people will use it like crazy. Look, even if you don't replace fiat, if folks can use it in leiu of fiat while out clubbing or whatever and deal with the back conversion at home it will be huge. Much easier than fussing with your bank or cash or whatever while you our out. How often do people have to track the IOUs while out with friends? Who doesn't have a mobile? Solve that problem with tools already in the toolkit and it will jump in value against fiat as its usefulness as a "wooden nickel" system becomes obvious. I think grass roots is much more likely to succeed in this particular aspect as opposed to some sort of "forced" centralized big bank approach (the discussion earlier about Amazon's p2p currency) because it feels lax which is perfect for a "social" currency.