Hashtags have been proven to be useful for many applications, including microblog retrieval (Efron, 2010), query expansion (A. Bandyopadhyay et al., 2011), sentiment analysis (Davidov et al., 2010;Wang et al., 2011).
hence, microblogs have also been widely used as data sources for public opinion analyses (Bermingham and Smeaton, 2010;, prediction (Asur and huberman, 2010;Bollen et al., 2011), reputation management (Pang and Lee, 2008;Otsuka et al., 2012), and many other applications (Sakaki et al., 2010;Becker et al., 2010;Guy et al., 2010;Guy et al., 2013).