The resulting performance drops have often been addressed via various domain adaptation approaches (Blitzer et al., 2006;Daume III and Marcu, 2006;Reichart and Rappoport, 2007;Chen et al., 2009;Daumé et al., 2010;Chen et al., 2011;Plank and Moschitti, 2013;Hovy et al., 2015b, inter alia).
the authors and target demographics of social media differ radically from those in newswire text, and domain might in some case be a secondary effect to demographics.