Facebook will soon launch the world's first digital payment currency: Libra. Libra's mission is to foster the development of a simple global currency and financial infrastructure that serves billions of people. This document presents the project, based on a new decentralized blockchain, a cryptomonnaie low volatility and a smart contract platform. The combination of these elements aims to create a new opportunity for innovative and responsible financial services. Libra will be sustained through a small charge per transaction on the blockchain. Many of these charges will be transferred to vendors who can then absorb the costs themselves or relay them to users. Collaboration and innovation with the financial sector (especially with of regulators and experts from various sectors) is the only way to ensure that this new system is based on a durable, secure and reliable framework. This can also lead to a real step towards a low-cost, more accessible and more connected global financial system. Washington and Brussels are calling for far-reaching regulation of Facebook. Responsible citizens have the courage to deal with the ideas of dissidents in social networks, and they have the ability to do so rationally and critically.