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2) "I got this private message that was addressed to someone else. Is that a bug?"

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Occasionally a copy of a private message will get misdelivered. If you received a private message without your name on it, that's what happened. The intended recipient should also have received it, so you shouldn't need to pass it on, though it doesn't hurt. Just delete it and go about your business. We really don't need this issue reported any more than it already has been - we are aware of it.
Incidentally, because of this bug you may want to be careful about sending anything very private by private message.