what is the process usually of talking to a girl on facebook?

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okay so i was at a party and a girl came up to me and talked to me for a little. And i always had her as a friend on facebook i dont remember how just we have a lot of mutual friends. im just wondering she has likes some statuses of mine and pictures on instagram. basically how do i hit her up? obviously im not a player and im good looking soo. just what should i do message her on facebook? and how should i message her? thankyou..