Bitcoin is actually a pretty cool concept and many people don't even really know what it is. Essentially, it's a currency like a dollar or gold, but it is completely digital and it is "mined" online. If you want to try out bitcoin for yourself for free, I have compiled a list of a few sites where they give you free bitcoin "pieces" that can add up to a pretty significant amount. I have cashed out a couple times now, and the value of all of my cashed out coin has grown exponentially since bitcoin seems to be on a rapid rise.