How to talk to girl on fb?

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i meet this girl with a few of my friends,she seemed really nice and i want to know her better and see what happens, she would say "aww" to me alot and hug and put her armm around me when ever she could, and i would stare at her, because i was high and she would stare and smile back and say you okay you got the munches and hug me.. well anyways ive never meet her before that so i find hard on what to talk about with her, im also really shy, but i added her on fb today she accepted and liked my profile pic.. do you think she likes me? what should i do? like a pic back how can i talk with her, i dont really know what we have in common so its hard.