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I know, I’ve seen it a lot myself too. But I don’t necessarily mind if people repost ‘em and don’t credit just as long as they don’t:
a) Claim they drew it
b) Make some sort of profit through it (making buttons/keychains/t-shirts/etc)
I really don’t like watermarking my stuff because it’d make me feel like I’m being some pretentious prick .-.