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Re:Twitter Creator Jack Dorsey’s iPhone Payment System by mrshoe on Saturday October 17, 2009 @11:23PM (#887888)
Hopefully they can overcome whatever knocked the PayPal crew off this idea originally:

http://en.wikipedia.org/wiki/PayPal#Beginnings

Maybe the ubiquity of iPhones was the missing ingredient?

Re:Twitter Creator Jack Dorsey’s iPhone Payment System by mahmud on Sunday October 18, 2009 @09:20AM (#888316)
Yep, let's hope they "overcome" gazillions of $.