Why won't my blog hosted on Wordpress.com activate?
Here we must draw a distinction between sites running WordPress code, and sites hosted on WordPress.com.
As any workaround we came up with would go against the WordPress terms of service you accepted when creating your blog, and as this could result in WordPress.com shutting down your blog, we cannot support free blogs hosted on WordPress.com.
However, WordPress does sometimes make exceptions. You can ask the WordPress staff for an exception here:
From here, you may want to:
You are here: About Project Wonderful → Publishing with Project Wonderful → Activating your ad box: