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Old 26 May 2017, 08:48 PM
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erwins erwins is offline
 
Join Date: 04 April 2006
Location: Portland, OR
Posts: 12,367
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For the same reasons one might sign an email or a letter, both of which have typically already identified the writer by the time they are being read.

Personal touch, formality, habit, taking personal responsibility or pride in it, etc.