UP-NOD DO'S
Always maintain eye contact.
Just a slight a 5 degree nod. You are acknowledging, not agreeing.
A slight eyebrow raise with a corresponding downturn of the corners of the mouth.is appropriate.
UP-NOD DONT'S
Never smile, you are not looking for a date.
Nod only once, you not a bobble-head.
No words, the up-nod speaks volumes.
Never up-nod a woman, they just don't understand.