Check my previous post. Libracoin is not a stable coin. They are claiming that it will be backed up by real assets (such as cash and bullion) and the exchange rate will be determined based on the supply-demand equilibrium. Considering the fact that many of the tech giants are supporting this coin, I assume that it will be able to attract many hundreds of millions of users. At the same time, they are saying that this coin will be available only in those jurisdictions where cryptocurrencies are legal.