Chris Poole, founder of 4chan, remarks (on his personal blog) on the debate for and against anonymity on the web:
The combination of anonymity and ephemerality has fostered experimentation and creativity rarely seen elsewhere. It’s incredible what people can make when they’re able to fail publicly without fear, since not only will those failures not be attributed to them, but they’ll be washed away by a waterfall of new content. Only ideas that resonate with the broader community persist, creating the most ideal conditions for the production of viral content, which established 4chan as one of the Web’s earliest “meme factories.”
Anonymity has fostered both positive and negative results online. Just like anything in life you must to take the bad in order to get the good. And you can learn to avoid the bad.