I've just submitted my first real monetisable app to the App Store review team. Once approved, I was planning to do a short little promotion campaign on social media. I'm no expert nor am I a big social media user myself but I know this is the way to get it in front of as many mobile users as possible. Do you fellow developers have any good tips on which platforms might be worthwhile or things you wish you knew before you put your hard earned cash into it?