I was wondering what service StackOverflow Careers use to determine their visitors location and if they can recommend a service.
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migrated from stackoverflow.com May 18 '11 at 9:40
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There are many methods to do this sort of thing, such as the ever popular Maxmind GeoIP system (which ultimately is using whois data).
More accurate geolocation is available in more modern browsers using HTML5 features, but given browsers have to request permission to get this data, this method can be ruled out for the adverts you mention.