Wherever Palin is going, she won't be going quietly

"Ain't gonna shut my mouth / I know there's got to be a few hundred million more like me / just trying to keep it free."

That's about as close as Sarah Palin, former Republican candidate for US vice-president and now former governor of Alaska, has come to explaining why she recently shocked the US political scene with her resignation.

She quoted the lyrics, from the song Rollin' by the country-Western duo Big & Rich, on a recent Tweet. She has about 100,000 fans on Twitter - but the big question is what she hopes to accomplish next.