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So what? Someone started a wakachan /ic after 4chan did(Disclaimer: I use mainly wakachan, but do post on 4chan too. Both forums have been "stealing" features and board ideas from each other since the beginning, so whining about it is moot, if you'll forgive the phrasing.
Repeat after me:
THERE IS NO RIVALRY
THERE IS NO RIVALRY
THERE IS NO RIVALRY