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Re:Ask PG: How would you have started Reddit/HN without your... by ra on Monday June 06, 2011 @10:29AM (#2624814)
That's a great contribution and really worthy of a blog post in it's own right.

But what's with the first (single word) paragraph? It seemed to me as particularly arrogant... really threw me off. I'm sure I misunderstood you intention, but it almost prevented me from reading the rest of what you had to say.

But I'm glad I got past that.

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:"
Re:Ask PG: How would you have started Reddit/HN without your... by stonemetal on Monday June 06, 2011 @11:22AM (#2625000)
It is a +1 mechanism for places that don't have voting, so far as I can tell. I have seen it quite often over on reddit. It used to be rather frowned upon here but the removal of visible vote numbers is likely to encourage it.
Re:Ask PG: How would you have started Reddit/HN without your... by petewailes on Monday June 06, 2011 @11:26AM (#2625010)
Basically what stonemetal said. With no vote count, it's a visual indication that I'm in agreement with what the person I'm replying to has said, and extending upon it.