However, popularity is not solely determined by content, e.g., a text or an image, but is highly affected by contexts, e.g., timing, and authority (Cheng et al., 2017;Burghardt et al., 2017;Suh et al., 2010;Hessel et al., 2017;Jaech et al., 2015).
to utilize popularity as an indicator of informativeness, we need to exclude the effect of context.