It's a very very nice talk. Worth you to spend 19mins time of your life to watch this video if you're interested in information technology and something that happen around you and you don't know that ! Hacker can be good or bad, like anonymous, they hack to the website just to prove something or want to against certain government's action.
One of the example is :
Malaysia government said that want to block all of the file sharing website like megaupload, rapidshare, and etc etc.
By the time Malaysia government said that wanted to block the website, there are a lot of number of government website had been hacked by the anonymous. They didn't do anything much beside distrub the website for few hours.
Why government wants to block these website? What benefit will they gain?