Just repeatedly tried to add a comment which references two @users. The usual message box pops up saying only one will be notified but as of today, the comment is not posted. If I remove one of the @users it is accepted and posted.
closed as off topic by jcolebrand♦ Oct 4 '11 at 21:44
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This is status by design
And for a lot more information see this post on meta.stackoverflow.com