Most viral videos
Videos were shared long before YouTube or even the Internet by word-of-mouth, film festivals, VHS tapes, and even to fill time gaps during the early days of cable. Perhaps the earliest was Reefer Madness, a 1936 educational film that circulated under several different titles. It was rediscovered by Keith Stroup, founder of NORMAL, who circulated prints of the film around college film festivals in the 1970s. The company who produced the prints, New Line Cinema, was so successful they began producing their own films. The most controversial was perhaps a clip from a newscast from Portland, Oregon in November 1970. In the clip, the disposal of a beached whale carcass by dynamite is documented, including the horrific aftermath of falling mist and chunks since the exclusion zone wasnt big enough. The exploding whale story obtained urban legend status in the Northwest and gained new interest in 1990 after Dave Barry wrote a hysterical column about the event, leading to copies being distributed over bulletin board systems—a sort of primitive Internet—around 1994.
A viral video is a video that becomes popular through a viral process of Internet sharing, typically through video sharing websites, social media and email. Viral videos often contain humorous content and include televised comedy sketches, such as The Lonely Islands Lazy Sunday and Dick in a Box, Numa Numa videos, The Evolution of Dance, Chocolate Rain on YouTube; and web-only productions such as I Got a Crush... on Obama. Some eyewitness events have also been caught on video and have gone viral such as the Battle at Kruger. More recently, the Kony 2012 video by Invisible Children, Inc. became the most viral video in history with over 34,000,000 views on the first day of its upload on 5 March 2012 and as of late 2013 has over 100,000,000 views. Another recent example is Gangnam Style by PSY. As of June 2014, the music video has been viewed over 2 billion times on YouTube, which makes it the most viewed video in the history of the site. (source : wikipedia