Seeing clicks but no revenue?

Have you ever checked your reports and noticed that you have clicks reported, but no revenue? I would  like to explain why this may happen, as we frequently receive emails and questions on our Help Forum about this issue. What you're seeing may be due to one of the following:

1. Allowed Sites setup

The Allowed Sites feature allows you to specify a list of sites where ads from your account may be displayed. If you're using this feature, you'll need to make sure that you've listed all sites where you'd like to display your AdSense ad code.