Tweet classification based on their lifetime duration. - Hikaru Takemura; Keishi Tajima (CIKM, 2012)

Why you follow: a classification scheme for twitter follow links. - Atsushi Tanaka; Hikaru Takemura; Keishi Tajima (HT, 2014)

Classification of Twitter follow links based on the followers' intention. - Hikaru Takemura; Atsushi Tanaka; Keishi Tajima (SAC, 2015)

Classification of Twitter Accounts into Targeting Accounts and Non-Targeting Accounts. - Hikaru Takemura; Keishi Tajima (HT, 2016)