Now when it comes to facebook, if I see a girl I am attracted to in her profile picture I add with no hesitation. I do not send a following message with the add but I wait until I am accepted then wait a little to see if she will message me wondering why I added her.
If she responds to you in a non threatening and a friendly way, you are over a hurdle and are set in good steed..
Two days a go I added a girl from university. I have never seen nor heard of her nor did we have any mutual friends. I added her and she replied the next day with,
Girl: 'Hey, do we know each other?

'
Me: 'Unless we have met before and we both can't remember'
I then said under this sentence, 'You looked safe so I added you, but you never know...'
and then i hit send, she replied, we had a little chit chat and then I said,
'What is your number, we should go for a beer of coffee...'
BINGO got number.
don't reply to the facebook message and two days after getting the number send her a text and go from there.
........
Now, if she does not respond send her a message and find a fault with her profile picture, the same day i added another girl and she did not respond with a message so i sent her this,
Me: 'Your top eye in your profile pic seems a bit bung, I am sure it is just the way the photo is taken haha'
Girl: 'Haha I can assure you it's not, it's just the photo, is that usually how you say hi, how are you?'
and we chit chatted, since she replied this afternoon I will wait till tomorrow to ask for number.
Will let you know if i get her number tomorrow..
IMPORTANT: Leave plenty of time between replying, leave a day if you have too, but leave heaps of space draw it out and leave it for the week days not weekends you want to look busy!
But keep it all in context with the vibe you get from the profile picture and have your profile set up to attract!