It’s been just a few weeks since the new Threads app burst onto the scene, threatening to be the ultimate Twitter-Killer, or platform formerly known as Twitter-killer. But it’s not just an alternative to the former bird app Threads has promised, but an alternative model of social media. One that is decentralized and interoperable. So how is this model different than the classic flavor most of us are used to? Marketplace’s Meghan McCarty Carino asked Arvind Narayanan, a professor of computer science at Princeton.