I want to vote for Elon Musk too, but Edward Snowden is too important. Also, why are there no women listed? Sheryl Sandberg and Marissa Mayer made lots of news this year.
As a European I don't even know who Sheryl Sandberg is, but googling her it seems she's not really practising what she preaches: http://valleywag.gawker.com/revealed-sheryl-sandbergs-unpaid... ;)
She's often described as the emotional heart of Facebook and is one of the few truly powerful women in tech and the only one currently directly engaging in the debate on the issues associated with that.
You can watch her truly inspiring talk on TED to get an idea of what it's all about: http://www.ted.com/talks/sheryl_sandberg_why_we_have_too_few...