im guessing roughly about 103,426 players
average number of kills/player is probably around 231 thanks to noobs
total number of kills probably is (whips out his geeky calculator) 231x103,426 = 23,891,406 kills which has just exceeded
the total number of deaths in world war 1 according to wikipedia
20,000,000 – World War I (1914–1918) (see World War I casualties)[8]