On the other hand, such strength of tags enables them to act as strong search keywords and efficient features for recommendation engines (Lambiotte and Ausloos, 2006;Szomszor et al., 2007;Li et al., 2008;Borne, 2013).
websites for different medias like photography 1 , literature 2 , film 3 , and music 4 have adopted this system to make information retrieval easier.