From the OxfordWords Blog:
The world of technology remains a major influence on the English language, with innovative advances reflected in new entries including ethical hacker, 3D printing, and e-learning. Social media also continues to shape language evolution: tweeps, video chat, lifecasting, and hat tip are among the latest words to make their Oxford Dictionary debut, while acronyms regularly used online (from lulz to OH and UX) have also been recognized.
Debate about how many times ‘ha’ should be added to the exclamation mwahahaha – another new addition, representing ‘laughter, esp. manic or cackling laughter such as that uttered by a villainous character in a cartoon or comic strip’ – is likely to rage amongst the tweeps.
Here’s a Selection of the New Words Added to Oxford Dictionaries Online (w/ Links to Definitions)

