The 30 Day List Building Challenge Facebook group is semi-public. This means that any current member can approve joining requests.
It is totally up to you what you would like to do with the request: approve if you know the person or ignore it otherwise.
NOTE:
You can also turn off the notifications. In the group, there is a ‘Notifications’ button in which you can toggle to off, as in the example above.
You can also turn off the notifications. In the group, there is a ‘Notifications’ button in which you can toggle to off, as in the example above.