The 4chan message board, a popular discussion forum for the so-called Anonymous activist group that launched a multitude of Denial of Service attacks in retribution for efforts to cut off technical and financial support for WikiLeaks, was itself shut down by a DoS counterattack on Dec. 28.
The site's founder, Christopher Poole, posted the message on the site's main page at 2:39 in the morning. "Site is down due to DDoS. We now join the ranks of MasterCard, Visa, PayPal, et al. -- an exclusive club!" according to the message.
As of today, the "current status" tool on the site reports all parts of the site as being up, and posts on various 4chan online forums confirm that the boards are back to normal. However, during the course of the attack, the 4chan message boards were the hardest hit, Paul Mutton, a security analyst at Netcraft, told BBC.
"For most of the past 24 hours, the site has either been very slow to respond or has been completely unreachable," said Mutton.