How unfollowing someone on social media became the ultimate hostile act - IN FOCUS: The silent rage of a simple Instagram click is something even we mortals know, but in the world of the celebrity, it can uproot families and cause media scandal,

Sandra Bullock had been avoiding Instagram for the longest time, but she finally made a debut this week — and her exchange with Nicole Kidman is making rounds on the internet. Her arrival on the platform felt like an iconic pop culture moment all on its own.