I can tell you from a woman's POV how it feels when you are messaged on FB by men you do not know. Of course this is just one opinion.

1) if a man chooses uniquely fitting words that manifest that he has read the woman's posts or looked at her pictures and has developed a genuine interest in her, such attention is very welcome

2) if a man uses corny expressions and it is clear that he does not read her posts, she blocks him.