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"It's like Craigslist -- hugely simple and highly useful," says David Weinberger, a fellow at Harvard University's Berkman Center for Internet and Society. 4chan's utility is its ability to gather millions of people in conversation in a single place and create a "meme-rich" environment, says Mr. Weinberger.

Mr. Poole originally just wanted a place to share his fascination with Japanese comics and television shows. He was a fan of the popular Japanese image Web site 2chan and wanted to create a version for American audiences. With his mother's approval, he used her credit card to purchase server space and started 4chan.org.

"They get rowdy -- it's like a bar without alcohol," says Willard Ling, a moderator and long-time user of the site. "It's like that psychological concept of deinvidualization -- when groups of people become less aware of their own responsibility." Mr. Poole and his team of moderators have handed out 70,000 bans over the last three years, but preventing long-term abuse can be difficult. 4chan's "Wild West" reputation has created a dilemma for Mr. Poole. While it's brought him Internet fame, albeit through his alter ego, and created enviable traffic, he has trouble selling ads to more cautious companies who don't want their ads appearing next to potentially graphic content. He's attempted to quarantine sexual material on a set of adult boards, but that doesn't stop pornography or other adult content from appearing elsewhere.