Hot answers tagged advertising
5
Give each coupon a unique identifier (a serial number in effect) and then track when a coupon is used recording the used identifier to prevent it being used multiple times.
Another option is to plan the promo in such a way that you have to do nothing and actually use people photocopying them as free marketing - it might not work in your scenario but it is ...
1
Google Adsense knows best. Google takes into consideration not only the content of the current visited website of your users, but also his previous websites and his ads "profile" on google.
Think about it, its one of Google's main sources of revenue + they have access to the users history (each site that displays adsense can track the visiting user, right?) ...
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