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Re:Show HN: My weekend project, Startup Tees by mw63214 on Monday July 11, 2011 @08:10PM (#2753017)
how about just a QR code on the back to a sign-up page with the shirt-wearers referral code?
Re:Show HN: My weekend project, Startup Tees by hkarthik on Tuesday July 12, 2011 @06:03PM (#2756816)
Even better!