Bitcoins are a currency that can be exchanged by personal computer directly through a wallet file or a website. They can also be exchanged through physical banknotes and coins. Unlike most currencies, bitcoin don't rely on bank or government.
As of 2013, bitcoin is the most widely used alternative currency. All bitcoins converted at the current market price would be worth over 100 million US dollars.
The numbers speak for themselves. Having a digital currency such as this devalues the American dollar, has no federal regulations, and ads to the current state of a struggling economy. The only people who benefit from bitcoins, are scammers (whether they know it or not).
Bitcoins are ponzi scams. You invest in digital nothing, get digitial nothing, and convert that nothing into dollars!