Could someone join this group on Facebook?

[Jubail]

and then write something on the wall, it's an open group I just want to know if every member gets a notification or not when someone either comments on someone else's post or just writes something on the wall, regardless of weather they are a friend or not.
https://www.facebook.com/groups/2384449337/

[Yuuuup]

When you create a group, you can choose who can see the group and stuff people post there. The three visibility options you have are:


â– Open: For Open groups, anyone on Facebook can see the group and join. That means the group will appear in search results and all content that members post (ex: photos, videos and discussions) is visible to anyone viewing the group.


â– Closed: For Closed groups, everyone on Facebook can see the group name and members, but only group members can see posts in the group. Unless you're added to the group by another member, you'll need to ask to join. You'll become a member when your request is approved.


■Secret: These groups cannot be found in searches, and non-members can’t see anything about the group, including its name and member list. The name of the group will not display on the profiles (timelines) of members. To join a secret group, you need to be added by a member of the group.

If you're an admin of a group with fewer than 250 people, learn how to change your group's privacy setting.