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Sorry guys, there's no magical formula to get them to notice you on Twitter, but they did shed a little light on some of the things that have worked in the past.
For Zayn, sometimes artistic fans appeal to him and he'll give a follow, as he revealed to BBC Radio 1's Scott Mills: "It's kind of just random...sometimes it's a bit unfair because if somebody's drawn a really good piece of art and they send it to you then that kind of catches your eye. Then maybe that's just me."
(Enrolling in art school right now.)
For Harry, it seems manners are everything, so polish up your Twitter behavior and put your best foot forward, as he explains, "Sometimes somebody just writes you a polite little tweet and you're like do you know what I will."