1. A method for selecting and placing an advertisement, comprising the steps of: (a) defining, by a computer, and storing on a computer storage medium an Ad campaign project model; (b) defining, by a computer, for said Ad campaign advertising messages and targets for placement in blogs according to a plurality of facets; (c) said computer defining one of said facets as a why-facet for each of said advertising message and targets, wherein said why-facet defines the objective of the advertising message and the advertising target; (d) said computer defining one of said facets as a how-facet for each of said advertising message and targets, wherein said how-facet defines the style of said advertising message and said advertising target; (e) said computer defining one of said facets as a what-facet for each of said advertising message and targets, wherein said what-facet defines the type of product or service of said advertising message and said advertising target; (f) said computer defining one of said facets as a who-facet for each of said advertising message and targets, wherein said who-facet defines the type of audience or community for said advertising message and said advertising target; defining keyword features and non-keyword features for each of said why-facet, said how-facet, what-facet and who-facet; (h) said computer receiving a blog content from a blogosphere; (i) said computer analyzing said received blog by extracting keywords and non-keywords from said blog, wherein said extracting non-keywords from said blog is based on said computer performing a combination of.” (i) a structural analysis of said blog, (ii) a stylistic analysis of said blog, and (iii) a linguistic analysis of said blog; (j) said computer classifying from said Ad campagin project model which type of facet of said plurality of said defined facets corresponds to said extracted combined keywords and non-keywords; (k) said computer determining which advertisement message and advertising target to be placed in said blog based on said classified facet; and (l) said computer communicating with said blog the placement of said determined advertisement message and advertising target in said blog, wherein said method does not rely on a demographic description, a survey or a self-declared profile.