| http://www.w3.org/ns/prov#value | - Let them do the work of deciding whether it is relevant or not.2) Some people have more than one browser, or more than one PC. Just because they are using FF to read the news headlines does not mean they might not have IE6 on the machine as well, or that the advert might not remind them to upgrade their other PC.Conclusion: Targeting based on the user-agent would be more effort and more false negativ
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