I remember working with a guy named Andrew Braccia at Yahoo, and Yahoo was the company that bought Flickr. Everyone on his team was hard working and reliable, did what they said they were going to do, on top of everything, and seemed to be operating at this level of productivity and effectiveness that I found difficult to manage to.

People sometimes forget how early Flickr came. Facebook didn't add photo sharing till a year after Flickr was acquired by Yahoo.

I learned so much in the year after Flickr was acquired. People forget, but Flickr launched in February 2004. And a year later, the deal was done with Yahoo, and we closed it in March of 2005. It was really independent for a relatively short period of time.

From the outside, Yahoo was extremely successful. It was making money; it was still bigger than Google. But when I got there, I learned what a disaster of a company looks like from the inside. There were a lot of vice presidents, and it was basically a turf battle between them.

Internally, we sometimes say Slack is like a nervous system, connective tissue, or the internal network.