Hey there. I only use facebook, on which i never post. My profile picture is a picture of my hair from behind and the about me section only covers where I live. I do use facebook for the messenger function, which works somewhat like SMS. So it would be wrong that I use social media to get laid as I only use messenger. I do not use instagram.
Back to this post, just add them on facebook or take their number. It does not matter how much of an impression you did, although it will help. The key here is to propose them FUN - i.e. a cool afterter party with boose, girls, men, games, big flat, cool sound system, not far away from the club.
That is what gets you the compliance.