Small earthquakes keep big ones from happening. Each magnitude level represents about 31.6 times more energy released. It takes 32 magnitude 3s to equal the energy released in a magnitude 4, 1,000 magnitude 3s to equal a magnitude 5 and a billion magnitude 3s to equal a single magnitude 9. So while a small quake may temporarily ease stress on a fault line, it does not prevent a large temblor.
This basically says "no effect either way" from my non-expert reading of it. Also, small quakes cause no damage. If fracking causes damaging quakes, then that's an issue. It's like saying "that wind from the desk fan is damaging me, like a hurricane would!" Umm, no it isn't. If it doesn't hit the threshold, you're being an idiot.