From job functions to group sizes to whole companies, Slack’s teams run the gamut. But there was one thing Butterfield ran into pretty consistently. When it comes to selecting a team-collaboration tool, every member has a veto — multiplying the product’s risk of rejection. “If one engineer at a startup tries Slack and says, ‘I hate it. I am not going to use this,’ that’s it for us. We won’t get evaluated.”

Bunch of good stuff in this piece on Slack. Well worth your time