facebookprivacy
How can I make it so that people who aren't my friends on Facebook can't see which groups I'm in?
This is similar to this question, but not quite. The linked question asks about keeping things private from my friends, while my question is about keeping things private from strangers.
Check (and keep checking) the privacy settings on your account.
On this page: http://www.facebook.com/settings/?tab=privacy
Make sure that you only allow friends to see your data.
On this page: http://www.facebook.com/settings/?tab=privacy§ion=apps
There's a "Public search" option - make sure that's set to disallow.
There's a option for "Information accessible through your friends" make sure that you clear all the check boxes on that dialog.
There's an "Instant personalisation" page - not available for all users as yet - but when it does become available make sure you clear that option too.
On this page: http://www.facebook.com/editaccount.php?ads
There are options for Facebook ads to use your data - clear both options.
You have to keep checking because Facebook regularly change the options and the defaults are to be more open than you would like.
Ultimately you are joining a site whose premise is the sharing of information. If you're not happy about sharing something - don't post it to the site, either directly or as a link. If you're not happy about sharing anything - then don't sign up!
This is a wall post.
It appears in your news feed when friend A posts on friend B's wall, and only works if friend B allows wall posts and has made wall posts by others public.
Best Answer
See Facebook's Help Community for this answer.
Normally, when viewing somebody's Profile, choosing "More >> Groups" will show the Open groups to which that person belongs. However, by editing the
Groupsection of your Profile (via the pencil icon):... and then clicking
Edit Sections:... one can choose which sections show up in the Profile, and which will not:
Unchecking the
Groupsitem will prevent it from being displayed in your Profile. Note, however, that individual stories relating to a Group can still appear on your Timeline, in News Feed, or elsewhere on Facebook!