2. The method of claim 1 , further comprising selecting a match threshold corresponding to a particular level of similarity between the personalization vector and the macro-context.
2. The method of claim 1 , further comprising selecting a match threshold corresponding to a particular level of similarity between the personalization vector and the macro-context. 4. The method of claim 2 , further comprising billing the advertiser a first amount when the match value is less than the match threshold.