They've been running it in different forms for at least a couple of years - Official Google Blog: Making ads more interesting
They've made it available to everyone from last month - Google Rolls Out Behavioral Targeting To All AdWords Advertisers
But you would more than likely have noticed it over a longer time than that... seomoz ads seem to be following me around wherever I go for ages... they must have been part of the beta testing stuff I guess.


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