There are three ways to send a broadcast message to groups of people.
Select a permission group when sending a broadcast message
Create a groups of preferred caregivers in client Carespaces and select a group of preferred caregivers when sending a broadcast message (new as of 7/29/18)
NEW Create custom groups and select a custom group when sending a broadcast message
To create custom groups, view the company chat account and select the new "Groups" button next to the "Broadcast Message" button. From there you can create groups and add people to use those groups.
Those custom groups will then be available for selection when sending broadcast messages.
Recent Direct Message (DM) Activity
There are timestamps in the direct messages lists. E.g. "2m" for two minutes ago, "1d" for one day ago, etc. Previously, those timestamps represented the time in which the last message was sent in each conversation.
That was problematic because the timestamps were updating when you sent messages; if you sent a broadcast message, you immediately lost visibility of recent responses to previous broadcast messages.
Now in version 3.1.5, those timestamps only represent the time that the other person last replied. This way you can scroll through the list of direct messages in your company chat account and get a good sense of recent replies so messages don't go unnoticed.