[Nagyman]

Search is also a major feature.

For integrations, Github tells us when there's a PR. Yes, there's a clickable hyperlink, but I also get to know a bit more inline. It's additional context you don't get with only a hyperlink. There's less switching contexts when things are inlined ... it's a UX feature. I'd call it a feed of things happening across all of my apps, mixed with the ability to discuss those things in a standard place.

The integrations also give you shortcuts to actions without switching from your "command" line. Sure there are _some_ tools you can install on your local machine, but none make it this easy. Butterfield had the same success with Flickr (which yahoo subsequently destroyed) in making a killer user experience. That was for photos, Slack is for communication.