This article was posted a couple months ago here and should answer your question: http://www.fastcompany.com/3041905/slacks-founder-on-how-they-became-a-1-billi

This article was posted a couple months ago here and should answer your question: http://www.fastcompany.com/3041905/slacks-founder-on-how-they-became-a-1-billion-company-in-two-years http://www.fastcompany.com/3041905/slacks-founder-on-how-the...