If you switch on hits tracking, WSN can track the number of times people view a listing. At Admin -> Listings -> Listing Settings you can set what situations count as a view.

The number of views is displayed next to the listing in the category listing, and on the details page. If you don't want that information shown, switch off hits tracking.

To track detailed stats and allow the owner of the link to view them you can turn on the statistics switch, which will enable a visitor statistics section in the member home area.