I really would like to say my congratulations to them. They are a pretty decent project management tool, we use them at ollaa and recently I have written a blog post about HipChat. http://ahmetalpbalkan.com/blog/why-we-love-and-hate-hipchat/ Atlassian is making really smart decisions.
Push notifications. They’re confusing. All the in-person communication is pushed, however room conversation is not unless you are @mentioned.
If you would like to make an announcement to 10 people, you have to mention them one by one manually.