> As it turns out, Slack founder Stewart Butterfield isn’t so sure himself. Speaking on stage at the Digital Life Design conference in Munich, Germany, Butterfi

> As it turns out, Slack founder Stewart Butterfield isn’t so sure himself. Speaking on stage at the Digital Life Design conference in Munich, Germany, Butterfield said he didn’t know why Slack had taken off while his last two startups had fizzled. “I get in trouble with my PR team for saying this,” he said. “But I have no f___ idea.” That being said, they respond to user feedback. For example, the mute a channel feature is very well designed. It took them a while to implement. It doesn't hide the channel in your list, it greys it out.