We also experimented with more standard methods, using WordNet and distributional similarity (Beigman Klebanov et al., 2012;Esuli and Sebastiani, 2006;Kim and Hovy, 2004;Andreevskaia and Bergler, 2006;Hu and Liu, 2004;Kanayama and Nasukawa, 2006;Strapparava and Valitutti, 2004;Kamps et al., 2004;Takamura et al., 2005;Turney and Littman, 2003;Hatzivassiloglou and McKeown, 1997).
we implemented a WordNet (Miller, 1995) based expansion that uses the 3 most frequent synonyms of the top sense of the seed word (WN-e).