Facebook was quick to promise that its Libra cryptocurrency would have the stability of real-world money behind it, but whose money will dominate? It's now particularly clear. Facebook sent a letter to German politician Fabio De Masi explaining that the US dollar will represent 50 percent of the backing for Libra. The remaining support will come from the euro (18 percent), Japanese yen (14 percent), British pound (11 percent) and Singapore dollar (7 percent). If you were hoping for currency representation from more parts of the world, you'll be disappointed.