A screenshot from a Slack demo.

Do you Slack? I didn’t used to, but I do now. And I’m pretty sure I’m getting more done and having more fun because of it. I like Slack. (So does the Church of the SubGenius, but that’s different.) Slack is spreading. If you don’t know about Slack but you use computers and work with more than a handful of people, you probably should know about it.

For the uninitiated, Slack is a workplace communications tool. It’s like a cross between email and instant messagin...