2. The method of claim 1 , wherein the word sequence is associated with a first linguistic item, and wherein the concept vector comprises a first concept vector, and wherein the method further comprises: performing said forming, transforming, generating, and projecting with respect to at least a second linguistic item, to produce a second concept vector; and comparing the first concept vector with the second concept vector to generate a similarity measure.
2. The method of claim 1 , wherein the word sequence is associated with a first linguistic item, and wherein the concept vector comprises a first concept vector, and wherein the method further comprises: performing said forming, transforming, generating, and projecting with respect to at least a second linguistic item, to produce a second concept vector; and comparing the first concept vector with the second concept vector to generate a similarity measure. 6. The method of claim 2 , wherein the first linguistic item corresponds to one part of an ad and the second linguistic item correspond to another part of the same ad, and wherein the similarity measure constitutes a quality measure that provides an indication of quality of the ad.