“Stewart Butterfield cofounded Flickr with his wife and then launched a nonviolent MMO that gained a cult following. Today, he’s releasing Slack, a team messaging unifier and archiving app for Mac OS X which got this resounding tweet of approval from Marc Andreessen yesterday. For all his feats, he should be Internet famous. But unlike his other famous Flickr cofounders, Butterfield has been innovating under the radar, attempting to solve one of the hardest problems in business. So how did he get from Flickr to gaming to here?” - × × ×

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