Especially around here, there's not too many zones where you can pass. We live in the curvy mountains. So, should you still pass? It'd be twice as illegal to; first off you're speeding, then passing in no-passing zones.
FWIW, I'm 21. What I normally do whilest driving is between +0 to +5 of the speed limit. If you come up on me, and ride my ass for a prolonged period of time, I will slow down to the speed limit if I'm going any above it. If that doesn't give you the hint, I'll lock it in at 5 under. If you still don't get the hint, it goes to 10 under. Around here, it never gets to that point. People realize they're not going to get me to go any faster. They get off my rear then, and we both do around +5.
I've already had people attempt to pass me in no passing zones. It's rare that anyone has been able to, as well, it's hard to beat the acceleration a 350 in a small and light car gives you. If you do try to pass me, though, I'll generally let you around. At that point, I grab your plate and well, you get a nice notice in the mail

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I'm not trying to police the roads. That's not my jobs. But as a citizen, when I see something wrong, I wont just turn a cold shoulder to it and let it go. It's already killed a good friend of mine, and put a relative in good danger.
When someone's tailgating me, I actually find myself hoping that something on the road ahead will give me a good reason to brake check.