About the word 'KK' I've heard that, they often use the word 'KK' instead of 'ok' when they have a online chat. I had saw a TV series named 'Victorious'. There was a girl in that series, she actually said 'KK' a lot. I'm not sure weather it's normal or not, because the girl had a very special character. Would you say 'KK' instead of 'ok'? Or that word only belongs to online chat?