I don't know whether you use Slack regularly, but given you're signed up for this newsletter, it's a fair guess you at least know what it is. I've got a Slack channel which I share with former Mozilla colleagues and friends which is kind of an always-on backchannel which crosses timezones and the various work that we all do. It's great.
Not everyone uses Slack this way. In fact, most people use it within a single organisation. It's touted as 'replacing email' which is an optimistic claim. The backlash against Slack and other 'work chat' apps has begun, as Stowe Boyd notes in this article. He makes some great points, not least of which is this one:
This is a specific instance of the general issue of ‘work as a commons’. The folks that naturally most closely tied to some definable work activities — like our marketing team, above — should have the largest say in how their work is performed, and the decision-making about their work practices. That’s what they share in common. While those farther from that work — the freeloaders that are crowding the chat with their noise, interruptions, and influence — should be kept from the set’s workings if that interaction is negative.
In other words, if you think of it for more than a second, as with any form of technology, it's not only the affordances and cultural norms built into the product that are important, but the ones you and your colleagues build up around it.
See also: Trello's 'don't do nothing' matra