However, the performance of standard POS taggers for English is severely degraded on Tweets due to their noisiness and sparseness (Ritter et al., 2011).
pOS taggers for English tweets have been developed such as ARK, T-pos and GATE TwitIE which reaches 92.8%, 88.4% and 89.37% accuracy respectively (Derczynski et al., 2013).