Chat rooms were widely used in the early days of the internet, instant messengers replaced them afterwards and they are getting popular again with a much focused use: team communication.
It is really handy to have all the members of a team talk to each other at the same place and have all that info saved (for searching later on).
By simply adding an alert contact (My Settings>Add Alert Contact>Alert Contact Type>HipChat or Slack), it is now possible to get a message to the room/channel of your preference once a monitor gets down or up.
Such a usage not only makes sure that everyone in the team knows how the related project’s uptime is performing but also removes any confusions about the connectivity to the related project’s URL(s).
P.S. HipChat’s self-hosted HipChat Server is supported as well