What's your company's @all usage/culture like for Slack/Hangouts?

I feel like my company is a little too liberal with it. I suspect it might be a sign of some sort of fragmentation, but I'm not sure what kind (e.g. org chart, proj mgmt, no established point of contact for certain things).

Usually, it's reserved for PSAs, 3rd party outage notices, etc. It's discouraged for things like one-off questions