Fiverr, an online "gig" marketplace offering Mechanical Turk-style piecework, has a thriving market for cheap offers to write positive reviews of your self-published Kindle books. Caveat emptor.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.