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The first image uploaded to the Internet was of the comedy band 'Les Horribles Cernettes', uploaded on July 18, 1992.

The Harlem Shake became an Internet meme in early 2013, with thousands of people uploading their own versions of the dance.

Twitch, the live streaming platform for gamers, launched under the name Justin.tv in June 2011 and rebranded in 2014.

The ALS Ice Bucket Challenge went viral in the summer of 2014, raising awareness and funds for the ALS Association.

The first recorded instance of an online flash mob was organized via social media in 2003, where users flooded a Habbo Hotel room.

Psy's 'Gangnam Style' became the first YouTube video to reach one billion views on December 21, 2012.

The Million Dollar Homepage, created by Alex Tew in 2005 to fund his university education, sold pixels of ad space for $1 each.$

The Facebook Like button, a feature to express user appreciation, was introduced on February 9, 2009.

Wikipedia, the free online encyclopedia that anyone can edit, was launched on January 15, 2001.

Reddit, the social news aggregation and discussion website, was launched by Steve Huffman and Alexis Ohanian on June 23, 2005.

Twitter co-founder Jack Dorsey sent the first tweet, which read 'just setting up my twttr', on March 21, 2006.

The first use of a hashtag on Twitter was by Chris Messina on August 23, 2007, when he suggested using # for groups.

The Kony 2012 campaign, aimed at making Ugandan warlord Joseph Kony globally known to have him arrested, became a viral video sensation in March 2012.

YouTube was founded by Steve Chen, Chad Hurley, and Jawed Karim, with the first video 'Me at the zoo' uploaded on April 23, 2005.