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Well I don't post on /p/ for starters, I'm selective of where it's posted. I do usually do a small watermark in one corner of the image, because I hate seeing big watermarks in other peoples' photos.
I don't really worry about it too much, I can always take more quality photos. The person that steals other peoples' photos can't. I do local photography so if it doesn't affect my business reputation, I don't worry about it.