If you click on your Farm Cash icon, it will bring you to a page where you can buy Farm Cash, but below it is a list of ways you can earn Farm Cash. I've been accepting other Facebook games and then after a while, I can always delete them if I want to. Doesn't give a whole lot, I think maybe 2 Farm Cash, but it's a start. Then there are surveys and other things you can sign up for. I always forget to cancel any of those and then I'm stuck with a bill, but if you're interested in what is offered, it is a way to earn it faster.