Ladies, how do you subtly flirt with a guy in an e-mail, text message, or on Facebook, and etc?

play 20 questions!! to test the waters and see how they feel about you, start with genaric questions like favorite food, or what would you do if you had 2 heads or w/e, and then go into like biggest turn on, or first thing you look for in a girl, and if you get a good vibe off of those then go a little further, rate me scale of one to ten, would you ever date me ect.. also start saying cute things and ending them in ^-^ or ;) it just makes it cute and flirty