No, people who are not members of the private Facebook group cannot see that you've joined.
Here's a breakdown of what's visible and what's not:
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Within the Private Group: Only members of the private group can see who the other members are. They can also see what you post within the group.
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Outside the Private Group: People who are not members of the private group will not see that you are a member. This includes your Facebook friends and the general public. Your membership is hidden from them.
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Your Facebook Profile: Your Facebook profile does not automatically display the private groups you've joined to the public. However, you can manually choose to share a post from a private group to your own timeline (though be mindful of the group's rules).
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Friends in the Group: If you and a friend are both members of the same private group, that friend will see you as a member. This is because they are inside the group.
Group Privacy Settings Explained:
| Feature | Private Group | Public Group |
|---|---|---|
| Who can see members? | Only members of the group. | Anyone on or off Facebook. |
| Who can see posts? | Only members of the group. | Anyone on or off Facebook. |
| Discoverability | Can be set to visible or hidden. If visible, people can find the group in search. If hidden, only members can find it. Discoverability is separate from membership visibility. You can have a private group whose name and description are visible. | Always visible - anyone can find the group in search. |
In Summary: Joining a private Facebook group keeps your membership and activity within that group visible only to other members of the group. People outside the group will not be able to see that you've joined.
