I n the modern world, there’s one surefire way to tell someone they’ve hurt you. It’s not to throw a drink in their face, or stomp your feet and call them nasty names. Such brazen child's play is seldom tolerated, no matter how justifiable; instead, you have to cloak your juvenile pettiness within the safe confines of the digital sphere, which means one thing and one thing only: you must unfollow them on social media . We see it play out in the celebrity world all the time. Just this week, reports circulated that Nicole Kidman’s 17-year-old daughter , Sunday Rose, unfollowed her father, Keith Urban , on Instagram . The move came after allegations swirled that relationships between the musician and his two children – he also shares a 15-year-old daughter , Faith, with Kidman – had become strained since the couple announced their split last year .…