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A comment on Twitter Creator Jack Dorsey’s iPhone Payment System. Parent comment

Re:Twitter Creator Jack Dorsey’s iPhone Payment System by jrockway on Sunday October 18, 2009 @03:55AM (#888145)
I will agree that the Web 2.0 version of an acoustic coupler is much smaller than the 1970s version:

http://en.wikipedia.org/wiki/Acoustic_coupler

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