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juldeaHuh. I just actually researched a question I'd had about LJ and tags, and there's indeed an answer, and it's one I like!
From http://www.livejournal.com/support/faqbrowse.bml?faqid=226 :
Tags inherit security settings based on the entries they are used with. For instance, a tag used on private entries or not used on any entries will be private, so none of your friends will be able to see or use it in your journal. If you use a tag on entries with a mixture of security settings, it will use the least restrictive security setting -- a tag used on a public entry and a private entry is public. There is no way to specify the security of a tag without changing the security level of the entries with that tag, since anyone who can see your entries can also see its tags.
Which means if I make umpteen private posts about my secret love of the Peruvian nose flute and use a tag that says "Peruvian nose flute" on all of them, that tag still wouldn't show up for you in my list of tags. Excellent! My secret double life remains secret.
From http://www.livejournal.com/support/faqbrowse.bml?faqid=226 :
Tags inherit security settings based on the entries they are used with. For instance, a tag used on private entries or not used on any entries will be private, so none of your friends will be able to see or use it in your journal. If you use a tag on entries with a mixture of security settings, it will use the least restrictive security setting -- a tag used on a public entry and a private entry is public. There is no way to specify the security of a tag without changing the security level of the entries with that tag, since anyone who can see your entries can also see its tags.
Which means if I make umpteen private posts about my secret love of the Peruvian nose flute and use a tag that says "Peruvian nose flute" on all of them, that tag still wouldn't show up for you in my list of tags. Excellent! My secret double life remains secret.