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4chan Uses Bing to Flood the Internet With Racist Images
(www.404media.co)
This is a most excellent place for technology news and articles.
So the campaign is coordinated
So they're white supremacist fascists
So they are inundating people with it
whether you think it's random fun or not is subjective, but the way they've described it is accurate.
I'm fairly sure they were being sarcastic ^^
/b/ (or /pol/) exploiting a loophole in a webservice for teh lulz, more news at 11.