If your adword campaign runs on the networks it is well worth doing this.
Updated Procedures for Blocking Parked Domains in Google Adwords
While we still spend about an hour per week scouting through our Google AdWords report for fake clicks, eliminating parked domains has removed the vast majority of the fraud that we had been encountering earlier. So taking these steps is definitely worthwhile.
In your Google Adwords account, choose “Reports” from the Reporting tab.
Create a Placement Performance Report as specified here.
Follow all the instructions as listed in the BGTheory.com page above, except that under the new Adwords interface, the navigation has changed.
The New Navigation
Opportunities
1.The BGTheory.com post above refers to a “Tools” tab in AdWords navigation. This tab no longer exists.
2.Now, users should navigate to the “Opportunities” tab. (Sound much more “market-ese” than “tools,” doesn’t it?)
3.On the Opportunities page, look for the Tools block in the left column
4.Click the “More tools” link to navigate to the Tools page
5.On the Tools page, choose “Site and Category Exclusion”
6.On the site and category exclusion page, choose your Campaign. (You should repeat this for all your campaigns).
7.After choosing your campaign, click the “Page Types” tab
8.Under “Page Types” tick the boxes for “Parked Domains” and “Error Pages”
The Final Steps
9.Then save all changes, and you are done.