“…Jafari Asbagh et al (2014) propose a streaming framework for detecting and clustering memes in online social networks. Meanwhile, tracking popular topics or emergent events is also an effective way to study the dynamics of collective attention or collective response (Bagrow et al, 2011), which essentially drives the formation of trends or spikes (Asur et al, 2011;Bao et al, 2013b;Wu & Huberman, 2007;Gomez Rodriguez et al, 2010;Lin et al, 2011;Romero et al, 2011b;Bauckhage et al, 2014;Sasahara et al, 2013;Ferrara et al, 2013;Bagrow et al, 2011;Ferrara et al, 2014). Stroud et al (2014) indicate that a news organization can affect the deliberative behaviour of commenters by tracking and cultivating deliberative norms via news organization involvement.…”