We tackle this problem by testing three different variants of the semi-supervised method for orientation detection proposed in (Esuli and Sebastiani, 2005).
we contend that the plain determination of the orientation of terms is not a realistic problem, since it starts from the nonrealistic assumption that we already know whether a term is subjective or not; this would imply that a linguistic resource that marks terms as "subjective" or "objective" is available, which is usually not the case.