Registering in a website that offers PPC will earn you bucks, but do not expect a big amount. It is easy to do, yet consumes so much of your time. For other sites, they will ask you to invite friends so you could have additional points as part of your commission. You can also do some research so you will not end up in a fake PPC site, wasting your time and at the end of the targeted points, the site will ask you some amount, or even invite 40 of your friends, which is hard to achieve