Fail Blog (typeset as FAIL Blog) is a comedic blog website originally created by Leechio in January 2008. The blog steadily grew in popularity, and in April 2008 was sold to Pet Holdings Inc., owner of I Can Has Cheezburger?The site prominently features pictures and videos of someone (or something) failing at something they are supposed to do, or displaying blatant stupidity or incompetence, captioned with the words "fail" or "epic fail".

The site has grown rapidly, with the style of the images used on the site growing to become a popular internet meme, and many other smaller sites have spurred after the meme's popularization. Fail Blog won two Webby Awards in 2009, for People's Voice in Humor and Weird. Fail Blog's first book, Fail Nation: A Visual Romp Through the World of Epic Fails (ISBN 9780061833991), was released on October 6, 2009.

In July 2009, Fail Blog received an email from Guinness World Records requesting that a Fail Blog entry, regarding the Guinness record webpage for "Most Individuals Killed in A Terrorist Attack" having a "Break this record" link, have the screenshot of the webpage removed on account of it containing the trademarked Guinness World Records logo. Fail Blog promptly complied with the removal of the image, replacing it by an edited version with all notable references to Guiness record webpage blurred out, and posted an entry on the incident (in an obvious manner of ridicule).

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