Facebook, the world’s largest social network with 2.4 billion users, is developing a cryptocurrency that has the potential to reshape the global financial system. Called Libra , the cryptocurrency and blockchain system is backed by major companies and groups and scheduled to hit the market in 2020. Facebook wants Libra to become a global currency that could help the 1.7 billion ‘unbanked’ people get access to financial systems. Unsurprisingly, the announcement was met with calls for tough scrutiny from regulators and skepticism from technologists and the cryptocurrency community. Congressional committee hearings already are planned.…