When a girl wants to chat up a guy but also wants to play hard-to-get at the same time, she just says "Hi" in facebook chat, and guy will "take over" the conversation from there.
Samantha (on facebook): Hi
Dick (on facebook): Oh hi samantha, how are you?
* silence *
Dick (on facebook): Pretty boring day huh?
* silence. Dick, sensing a faceping prods on *
Dick (on facebook): So, any news?
Samantha (on facebook, faking disinterest): meh