I disagree that 4chan is a community of hackers for one simple reason: to me a hacker is someone who gets things done. 4chan and other sites that focus on memes are attention diverters, full of people who jump from one lol to the next.
In contrast a hacker is someone who is willing to focus time and attention on one thing until he excels in it. The 4chan mindset is not a long term, viable one, because the lulz distract from any real good that can be done. Sure you can pick through the porn, rubbish, and hate in 4chan and come up with examples of great things being done, but if you look at real hackers, such as the internet entrepreneurs that are creating web startups at http://news.ycombinator.com you see many great things being created with little rubbish, not a few great things mixed into volumes of lulz.
I don't look to 4chan to create long term internet change. They are great for creating laughs, but the next Facebook, the next Twitter, the next great internet technology will not arise from them. It will arise from true hackers who still hack in the traditional sense, by writing code and coming up with innovative technological ideas.