You don't like people spamming your profile with stupid messages?
Well, then control it or turn it off by adjusting the checkboxes accordingly:
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Social Groups can be seen by any registered user, unless the "User must join to view" checkbox is ticked.
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The example MLUKFC Monkeys group is a "Invite only, must join to view" group. Notice the missing last post details.
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More questions?
Just ask ...