Anyone using Slack?

As a startup we're completely hooked on Slack (http://www.slack.com/). As a matter of fact, we've banished internal emails. All our tools are converging and sending notifications into Slack. I really wish I had this tool when working in Procurement in my previous job (a multinational company) because I think it would have been great to 1. build the Procurement community internally and share knowledge/best practices, 2. collaborate with our stakeholders and suppliers on specific projects. Is there anyone in a Procurement organisation using it today?