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The amount of time a piece of random email will circulate the web and return to it's originator. Usually the longer lasting orbit, the better the impact for the originator because they know their spew is still circulating.
Dave's email about the girl needing money for an iron lung held a record among junk e-mailers due to it's lengthy 8 year Cyber-orbit
by The_Santino April 19, 2011
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