You have a lot of responses, but none actually address your question... > Who builds an internal chat client, while building an online game, and then decides t

You have a lot of responses, but none actually address your question... > Who builds an internal chat client, while building an online game, and then decides to build a b2b business around that chat client? Someone who's done something similar — successfully — once before, that's who. The experience gained from Flickr certainly helped with Slack.