Put yourself in their shoes. They think differently than us men but bear with me and think like a girl for a sec. (I used to make the same mistakes a long time ago)
Guy: Hey
Girl: *Thinking* ooh new message...wait do I know him? Not really... Why is he messaging me? Creeper...I'll just ignore that one*.
See what happened there? If she ignores a message from you, that means there's no Attraction whatsoever between the two of you. Just like you would jump at the chance to talk to a really hot girl, a girl will jump at a chance to talk to a guy they feel a 'spark' with.
(*Note how she thought
'i'll ignore that one'. The key to making Facebook chat work is being more interesting than all the other guys she's talking to at that moment. Just
ASSUME she has multiple guys messaging her, trying to take her out. Just always ask yourself:
how can you be the most interesting guy she's talking to? One great answer to this is to NOT USE FB CHAT AT ALL. Be the guy with the confidence to talk and flirt with her face to face
Good luck mate.