Head to the (i) icon to see the addressees list in a group yap.
This list could be made up of a mixture of individual profiles and role or location groups.
If a role is included in the addressees list, everyone associated with that role in your HR data will be a participant in the group yap e.g. Bar. You will also be able to see a count of how many users are currently associated with that group.
If a filtered group is included in the addressees list, everyone who fits the applied filter in your HR data will be a participant in the group yap e.g. Bar in Soho, Victoria & Camden.
To see a complete list of individual participants by name, click any message in the yap and select "Who has read this message?" from the context menu.
The list, comprised of those who have and have not read the message, contains all conversation participants.