Earlier quoted context omitted.
Wow quick to the low effort Slack is just IRC comment. In my opinion Slack does something that is often very undervalues and easily overlooked, it is like the opposite of a death my a thousand cuts - superiority by a thousand minor improvements. When taken individually or even in handfuls none of the features are that impressive, but cumulatively it creates a much better product. This was very apparent to me at least…
The one thing that I liked (and still like) about IRC is its federated server model. Maybe I need to do more research, but I guess I am assuming that slack is a for-profit company with private servers that they own somewhere that everyone uses ... or am I totally off?
The brilliant bit is that you can set up your own homeserver which holds all your chat logs, can authenticate against whatever you like (internal username/password, LDAP, or even CAS single sign-on), and allows you to communicate with people and rooms on other homeservers without having to manually connect, create a dozen different accounts, etc.
I think right now, 50% of users are on the matrix.org homeserver and 50% are on their own homeservers. And the upside of everyone being on a homeserver is that everyone essentially has their own bouncer by default - no more having to set up ZNC on some random VPS on a user-by-user basis, you can always message anyone and they'll get your message whenever they reconnect.
Because of its federated model, you can also use it to communicate with other companies and customers as well as internal communications - something Slack/etc aren't really chasing after.
[0] https://matrix.org [1] https://riot.im