You can subscribe to receive push, desktop or email notifications for several items in BizChat. To set notification preferences on web, select the drop down at the top bar next to your profile picture and click on Settings. In the Email Notifications and Desktop/Push Notifications section, you have the option to set preferences for People and Chat. You can select each preference independently by clicking on the checkbox and choose to be notified via email and/ or desktop notification.
On mobile devices, you can set notification preferences by clicking on More at the bottom tab bar and select Settings, then Notifications. Within Set Preferences, you can turn on/off each preference independently for Posts, People, Chat and Tasks.