The company today unveiled the system as a beta test in the US and said it would soon be made available to UK and European users.
The tool shows consumers a list of interest categories, such as 'automotive' or 'finance - insurance', and whether Yahoo's system is treating them as interested in each category or not.
The system takes into account information about the pages users have visited, ads they have seen and clicked on and searches they have made on Yahoo!
Yahoo! account holders can alter these settings and a planned enhancement to the service will allow them to add categories of interest that Yahoo! may have missed.
The launch of the tool comes three months after in London to showcase the power of behavioural targeting to advertisers.
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