Are there hidden ads in your WordPress theme?
Just Shelly has posted an interesting article about how some WordPress themes incorporate advertising links. If those links are not removed when you modify the theme for your own use, you’ll be including ads on your site that you’re not getting compensated for! And those ads aren’t necessarily for products/services/sites that you want to promote on your site.
Read more here: http://just.shelleypowers.com/technology/watch-that-theme/