There are dozens of companies that will pay you to surf the web. All they require is that you allow a small advertising banner on your screen, while you are surfing the web or in some cases, simply connected to the net. This is a way for companies to advertise products and services to consumers and you get paid to help. You can earn even more by referring friends and getting paid when THEY surf the web. Some companies pay a fixed dollar amount, while others pay a percentage of the advertising revenue they receive.
Most companies have a limit on payable hours per month.
You can also earn money by referring other people. You get paid for each hour they surf. You also get money for referrals made by your referrals, several levels deep.