Now, this is a chat/collaboration tool for businesses. It gives them a central place to discuss all aspects of a project.
Why is this huge?
Well, for several reasons. One, FB is trying to move into Microsoft's territory withe their version of a project management resource.
And two - Slack is something similar, and over the weekend, a product about profiting FROM Slack (Profit Slaker) was released.
Here's some ways Slack can be used as a marketer:
22 Handy Slack Hacks Everyone Should Know
7 Amazing Slack Apps That Will Turn You Into a Better Marketer
And FB's new venture into this territory...
... well, who is to say something similar can't be created as well?
Something to remember.