IPhone, MySpace, Facebook Race To Micropayments In 2009

i think for a true micropayment system to work it has to be usable across domains instead of just within a social network... this means the iphone, myspace and FB have to agree to use standard (open or other wise) protocols... without a common system all developers would see is increased transaction costs in the long run... either that or one social network/distribution channel has to beat all others which I dont see as a likely outcome or alternative..