“…Of the 74 studies, 44 (59%) developed ad-hoc methods to predict the Twitter users' gender. Of these 44 studies, 32 (73%) predicted the users' gender alone [49,50,52,54,57,58,68,69,71,72,75,76,79,81,82,85,86,89,92,93,96,102,[104][105][106][107]111,113,115,117,121,122], and 12 (27%) predicted gender along with age [51,55,65,70,80,83,87,101,108,110,112,116].…”