/r9k/ was restored on October 23, 2011, along with /hc/ ("Hardcore", previously deleted), /pol/ (a rebranding of /new/) and the new /diy/ board, in addition to an apology by Poole where he recalls how he criticized the deletion of Encyclopedia Dramatica, and realized that he had done the same.
In 2010, 4chan had implemented re CAPTCHA in an effort to thwart spam arising from Java Script worms.
The site has been linked to Internet subcultures and activism groups, most notably Anonymous, the alt-right and Project Chanology.
4chan users have been responsible for the formation or popularization of Internet memes such as lolcats, Rickrolling, "Chocolate Rain", Pedobear and many others.
The site's "Random" board, also known as "/b/", was the first board to be created, and is the one that receives the most traffic.