I am not a dating expert but I can tell you a trick how to talk to a girl for the first time in Facebook.
If you start with a normal hi or hello then your chances of chatting may be just drop to one day chat. I am not telling to start with hi or hello but add something with that. I think your got my point.
Normal chat
You:Hi
She:Hello
You:Nice dp
She:Thakewww
The above is the normal chat which you can do normally but there would be no suspense after that as girls like to enjoy compliment and here you have already finished what your have to say.
Remember one thing that in this world each and every girl whether she is a beauty queen or an upcoming diva or just an average one all are much curious about their look.
Here is the my trick
You:Hi
She:Hello
You:Nice dp but one thing missing
She:What ?
Here the show begins
The girl is now thinking what is missing in my dp.
I think you understand why I put bold mark on but because but is a very strong conjunction to link two or more sentence and that why I am using here to put a bridge between you and her. Just use the conjunction but and drove your way and tell them what you want to tell.
Now your turn to tell or ask whatever you want to ask or chat with her as you have put a barrier and create a confusion on her mind that she has a pretty face but yes but something is missing. She will repeatedly ask you in some interval during your chats.
It depends on you whether to tell her the missing thing which is never missed in her dp or lose your chance or take some time or chance to know her better and build a connection but remember never ask for her time. If you ask her whether she is free or not then it must be 2 or less than 5 minute conversation. Just create a mystery from your side and also let them be also the part of that mystery as they are also mysterious and that why they deserve some mystery.
Is you are having problem with your crush or a with a new girl with whom you want to talk.
Go and have fun with the girl for whom you have waited for long time or for a short time