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If a person is to be truly invisible then there should be no way to establish that they are online or eve exist on the system.
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Thats the point I'm trying to make though....you _can't_ establish which invisible users are online. Take this forum as an example...there are about 12,000 users....if there are 2 people online and one is invisible, are you telling me you could tell me which user it is?

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Currently an invisible user is shown in the "list" but the tag "invisible" is added to their information line. This is not an invisible user.
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I think you may be taking "Invisible" in a different way than intended. I don't think invisible means you should be non existant, it just means you can't be tracked.