techgnome. I watched a youtube video talking about currency once (entertaining, I know)... actually I think it was a video explaining bitcoin...

But it was just what you said. Money only has value because we as a whole have decided to give it value and we agree that it has value. Should we all decide we no longer want to have the US dollar as the main currency, then we could make that happen (theoretically).

Thats how they described bitcoin. It only has value because a large number of people agree that it has value. But besides that, Its just numbers in a database...