http://valleywag.com/5017424/stewart-butterfields-bizarre-
resignation-letter-to-yahoo Stewart Butterfield’s resignation letter from Flickr: “As you know, tin is in my blood. For generations my family has worked with this most useful of metals. When I joined Yahoo! back in ’21, it was a sheet-tin concern of great momentum, growth and innovation. I knew it was the place for me.” 07:03