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Re:Ask PG: How would you have started Reddit/HN without your... by danparsonson on Monday June 06, 2011 @11:28AM (#2625023)
"This" as the start of a reply is shorthand for "the comment I'm replying to makes a very good point that I agree with entirely" (and usually "and here's my take on what (s)he wrote"), rather than "what you are about to read is the answer you are looking for".
Re:Ask PG: How would you have started Reddit/HN without your... by ninjaa on Monday June 06, 2011 @07:28PM (#2627206)
"This." is shorthand for "This is how:"