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You don't have to post here to be well-known, ever wondered why you have 25 karma? I knew you from before I made that comment. As for Dankit, he just saw you online and greeted you.
No, you start with zero karma. You having 25 karma means 5 different normal users (including me, obviously) voted you up. It can be less users if you count a mod, but I'm lazy with maths and probabilities right now. :P