We have many "private sector currencies" right now. Most people don't keep their assets in cash. If I buy any hard asset it is a currency -- not as directly l

We have many "private sector currencies" right now. Most people don't keep their assets in cash. If I buy any hard asset it is a currency -- not as directly liquid as cash since we don't have laws in place requiring a store to take my fine art in exchange for groceries. As far as online currency, Facebook has the best chance to establish this: http://www.facebook.com/credits/ http://www.facebook.com/credits/