Why is there a difference between info on the Listing's Detail page and Post Ad page?

When you access the Post Ad page for the first time the information such as the Default Ad Title and Description on the Listing's Detail page will be copied over to the Post Ad page. Please note, this will only happen when you visit the Post Ad page for the first time. If you make a change on the details page for a listing, you are required to manually update the Post Ad page afterwards.  Such a feature allows you to control the information that is being submitted to Craigslist different from the one that is being syndicated to the advertising sites.

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