Google Adsense
Google is, probably, the biggest feeder of contextual advertisements used online.
When you put Google Adsense advertisements in your site you earn money each time someone clicks on them and that happens your account in Google Adsense is credit by some ammout.
The value of each click varies depending on the price the advertiser have paid to Google. Usually in each click we earn at least 2 cents but the value can reach bigger values.
The minimum value to request a payment (payout) from our account in Google Adsense to our account in Paypal are 100$.
In Google Adsense there isn't a downline system.
After you have created a account in Google Adsense you should generate the HTML code to put it in your website. The contextual advertisements start appearing some minutes after.
It is very important to note that like in Domain Parking business you cannot click in the advertisements shown in your site neither incentivize the clicking by friends or using PTCs and PTRs. If that happens and your account will be blocked and you lose your money. You should read the terms when you sign up in Google Adsense.
