Tech billionaire Elon Musk has unveiled the latest change to Twitter after his US$44 billion takeover of the social media company last October. The app’s iconic bird logo has flown the coop, with Musk replacing it with an ‘X’ to bring it in line with his other company and child names. “Not sure what subtle clues gave it away, but I like the letter X,” Musk says of the rebrand. It comes after he admitted that advertising dollars have been slow on Twitter since he took control of the company. And if you’re feeling a bit nostalgic for the blue bird, one of its designers has broken down exactly how it came to be. “This little blue bird did so much over the last 11 years,” Martin Grasser says. And now it’s time to fly away and be free…