I really like the idea of having an universal online currency and I wanted to know if I can use it in the 'surface web'.
There are a number of applications. Bitcoin is e.g. used for
- donations, e.g. Khan Academy
- online-shops for digital goods, e.g. vpn, web hosting, mail servers, mp3s, computer games
- mail-order companies, e.g. Overstock
- booking flights and hotels, e.g. on Expedia
- brick and mortar stores
You can find a more complete overview on the question Where can I find a list of merchants who accept bitcoins?
With the Shift card, you can spend Bitcoin anywhere Visa is accepted.