If you have used our service before: Duplicate submissions will automatically be avoided by our system.
If you have not used our servicebefore: You are given the option to upload a list of directories to which you have previously submitted. You can do the same by logging in and clicking on the 'Upload Submissions' link under the 'My Account' page.
If you don't have the list of directories to which you have submitted, we do not check to see if the site already exists. However, this will not pose a problem with most directories since they usually return an error stating 'URL Already Exists'. Nonetheless, you will still be charged for the submission as it takes us the same amount of time in making a normal submission.