I find using humor in your initial message really breaks the ice and gets them to message you back.
one thing i like to do is, if the girl has a photo of them with there dog or cat i will send them a message like this,
"Sooooo your dog messaged me on skype today… he said you were snoring so loud last night. he said you almost woke up the whole town!! he was laughing pretty hard. "
Well, hope you have a good day
they usually message me back saying it was hilarious. thats kinda my personality though im a bit left field… haha