2012: The use of Bitcoin was controlled by early adopters, developers and small-scale online retailers. Worldwide reception was very poor. There was no exchange and wallets were primarily desktop.
Controlled or Used? Bitcoin has been and still remains a decentralized system
No exchange in 2012? MtGox 2010 and Bitstamp around 2011 and they were still operating in 2012
Web Application Mining-Network Security
uhh, Bitcoin mining involves computational work to solve cryptographic puzzles not web applications.