I was looking for a way to give some privacy to users here from the same IRL family. Two users who would rather not cross paths could mutually agree to put each other on ignore; but, they would still glean much from the surrounding conversation by others. There would also be no way to verify compliance. Social Groups is the only way I've noticed that one user can exclude another user from viewing their posts and posts by others containing sensitive information.
Just trying to give a departing user another option that's immediately available.
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