https://arstechnica.com/tech-policy/2019/07/facebooks-half-baked-cryptocurrency-libra-explained/

Mark Zuckerberg is known for his boundless ambition. He's had a longstanding fascination with Caesar Augustus, the Roman emperor who (in Zuckerberg's words) "established 200 years of world peace." So having conquered social networking, Zuckerberg has his eyes on something bigger: reshaping the global financial system.

Payment services from rivals like Apple and Google essentially offer an improved user interface for conventional credit card networks. Facebook, by contrast, is aiming to use blockchain-like technology to build a new payment network from scratch, complete with its own currency.