Note however that neither source say even a single word about about Scientology or Anonymous' protests.
Here are a couple of excerpts:
"You may not realize it, but 4chan has probably touched your life. Possibly inappropriately. 4chan is unusual in several ways. It's extremely large and active; it gets 8.5 million page views a day and 3.3 million visitors a month. Since moot started it in 2003, those visitors have put up 145 million posts. By some metrics, 4chan is the fourth largest bulletin board on the Net.:
"Over the last few years, 4chan.org has become one of the most talked-about sites when it comes to launching new memes. "
"A book based on the site is coming this fall for Gotham Books."
"A large part of the site's success is its emphasis on anonymity. Users are not required to provide a working email address or any other personal information, a standard practice for other online communities like Facebook or MySpace. "