My opinion? Ignore them. I rarely get the guy right behind me because usually he can pass me anyway, and sometimes cut in front of me (thinking that I care, or that he/she showed me!).
Mostly tail gaters get tired of tail gating people that don't drive at a constant speed. Vary your driving speed almost imperceptibly by just by 1 or 2 miles per hour, and they eventually get tired of trying to figure out what speed you are going, and back off just a bit. Doing this slow enough that passengers can't notice yet force the person tail gating to match you is all that it takes.
Obnoxious I know, but what else is there to do? My other strategy is to leave space ahead of me for BOTH myself and my tail gating friend. That also makes one few friends among the rabbit drivers.