Slack announced yesterday that it raised $160 million at a $2.8 billion valuation. The company hasn't spent a penny of the $120 million it raised just last October. When Slack raised that money, founder Stewart Butterfield said it was enough to last them 60 years. Besides creating a Scrooge McDuck style swimming pool, why exactly would a company take on such an ungodly amount of cash while claiming at the same time that is has no need for it? We hopped on the phone with Butterfield to find out. Continue Reading