Maybe an HN blackout won't directly raise awareness, since you can't really be an HN participant and not know about SOPA. But having another site join the black

Maybe an HN blackout won't directly raise awareness, since you can't really be an HN participant and not know about SOPA. But having another site join the blackout may help raise exposure among those who run other websites, so it may help expand the blackout to other sites whose absence will be noticed by the people who need to know about SOPA.