Some company will pay you to click on links that are listed on their sites, instead of sending you a mail. These company are named Paid To Click and they have some interesting advanteges . First of all, the clicking procedure is very easy: you can open multiple windows at once, moreover the main part of these links aren't searches! (So you can simply click and close the window)

Apart from that, the system is the same of the PTR one: there will be some referral level, you can be paid immediatly or there could be a point conversion at the end of the month ect. ect.