How to start a conversation with a girl on facebook.?

[natedog]

Ok their is this girl i added on facebook, and she was in my class last year but moved to a different school but i was only in that class for a couple weeks and i never got to talk to her. Well i just added her on facebook and i was wondering how to start a conversation with her without sounding like a creep any advice. Like i can talk to girls just on facebook i dont know how.
Ohh n here another thing im 17 going on 18 here soon and she just turned 16

[Kaleb Alemayehu]

I have to say, the hardest part is sending the first message. You can say, "hi, long time no see, whats up?". You know what to say, now all you have to do is say it.

[Lauren]

Just say hi and how are u then ask something like wuu2 (what you up two) and just get the conversation going the first words are the hardest just catch up with each other ask how life is and stuff