1. A method for selecting and placing an advertisement, comprising the steps of: (a) defining a why-facet and a how-facet, wherein said why-facet defines an objective of an advertising message and/or an advertising target, and wherein said how-facet defines a style of said advertising message and/or said advertising target; (b) having a model of features classified along said why-facet and said how-facet, said model is based on: (i) extracting features from a set of blogs of at least one blogosphere, wherein said features include non-keywords and keywords, and (ii) classifying said extracted features along said why-facet and said how facet; (c) defining an advertising campaign in terms of said defined why-facet and/or said how-facet; and (d) using said model to determine placement of said advertisement in a blog.