This article relies excessively on references to primary sources .(September 2009)
SITO is an online artist collective which began in January 1993,  making it one of the oldest Internet-based art organizations. It was started by Ed Stastny and has been maintained by Stastny and a group of volunteers and supporters.
From its beginning, SITO had a mission different from many established Internet art resources, in that rather than be an electronic journal of discussions or writings about art, it chose to be a repository for artwork in order to facilitate sharing and exposure. As this was the Internet pre-World Wide Web, SITO accomplished this by using anonymous FTP sites. Another important part of the SITO mission was to be open to all levels of artists, and at no cost. SITO was one of the earliest online galleries, and this showcase of artwork has become known as the Artchive.
Popular pronunciations of SITO are SEE-toe and SIT-oh. SITO was originally called OTIS, which was an acronym for "Operative Term is Stimulate". The title SITO is merely a reversal of OTIS and is not officially an acronym, though some playful expansions have been suggested by users of the site. One such expansion is "Still I Think OTIS", which has the distinction of containing a nested acronym.
Another focus of SITO that soon developed was an active interest in art games and experimentation with collaborative art projects using the Internet as a means of communicating. The first few such projects dabbled in dividing digital canvases amongst several artists (e.g. Grid and Crosswire  projects) or translating traditional art games such as exquisite corpse to the digital medium.  These projects were in full swing by 1994 and were grouped together under the heading Synergy on SITO. 
In 1996, the SITO Synergy project HyGrid was honored with a Prix Ars Electronica award.  HyGrid is a twisting, looping, multi-dimensional maze of small panels of art which is built up by hundreds of artists. It is still active today. Gridcosm started in 1997 and proved even more popular with over 22000 contributions to its recursing collaborative collage and continues to grow daily.  
SITO originally was announced as "The OTIS Project", with a subtitle of "The Operative Term is Stimulate", which is where the acronym OTIS came from. This mostly whimsical choice became the name of the project and, in mid-1995, became an unexpected problem. An art college in the United States named Otis was troubled by the fact that OTIS made use of the term "OTIS Gallery" and used the domain otis.org. They sent a cease-and-desist letter and various other threats. The collective discussed the situation and decided something so whimsical was hardly worth fussing over and elected to simply reverse the acronym, thus becoming SITO. 
The Great Renaming was a restructuring of Usenet newsgroups that took place in 1987. B News maintainer and UUNET founder Rick Adams is generally considered to be the initiator of the Renaming.
alt.binaries.slack is a Usenet newsgroup created for the purpose of posting pictures, sounds, and utilities related to the Church of the SubGenius, making them available for everyone to see and hear. Because the Church of the SubGenius is well known for encouraging sick and twisted humor, the newsgroup is also home to artists who post humorous artwork of all sorts. A fair amount of the pictures on alt.binaries.slack are adult-oriented, and may be considered offensive by some viewers. The denizens of the newsgroup state that they enjoy deliberately offending those who are too easily offended.
Electronic art is a form of art that makes use of electronic media. More broadly, it refers to technology and/or electronic media. It is related to information art, new media art, video art, digital art, interactive art, internet art, and electronic music. It is considered an outgrowth of conceptual art and systems art.
Google Groups is a service from Google that provides discussion groups for people sharing common interests. The Groups service also provides a gateway to Usenet newsgroups via a shared user interface.
Eternal September or the September that never ended is Usenet slang for a period beginning around 1993 when Internet service providers began offering Usenet access to many new users. The flood of new users overwhelmed the existing culture for online forums and the ability to enforce existing norms. AOL followed with their Usenet gateway service in March 1994, leading to a constant stream of new users. Hence, from the early Usenet point of view, the influx of new users in September 1993 never ended.
Etoy is a European digital art group formed in 1994. It has won several international awards including the Prix Ars Electronica in 1996. Their main slogan is: "leaving reality behind."
The Prix Ars Electronica is one of the best known and longest running yearly prizes in the field of electronic and interactive art, computer animation, digital culture and music. It has been awarded since 1987 by Ars Electronica.
UBERMORGEN.COM is a Swiss-Austrian-American artist duo founded in 1995 and consisting of lizvlx and Luzius Bernhard. They live and work in Vienna, Basel, S-chanf near St. Moritz and in Cologne, where both are professors at the Academy of Media Arts (KHM).
The television series Babylon 5's use of the Internet began in 1991 with the creator of the series, J. Michael Straczynski, who participated in a number of Internet venues to discuss elements of his work with his fans, including the rec.arts.sf.tv.babylon5 Usenet newsgroup, where he continued to communicate as late as March 2007. This flow of information and feedback had a substantial impact on Babylon 5, as well as Straczynski's other shows and his fan base. This interaction pre-dated the coining of the term "blog", but is functionally similar.
Stelarc is a Cyprus-born Australian performance artist raised in the Melbourne suburb of Sunshine, whose works focus heavily on extending the capabilities of the human body. As such, most of his pieces are centered on his concept that "the human body is obsolete". Until 2007 he held the position of Principal Research Fellow in the Performance Arts Digital Research Unit at Nottingham Trent University in Nottingham, England. He is currently furthering his research at Curtin University in Western Australia.
Gridcosm is a collaborative art project of the online art collective SITO, in which artists from around the world contribute images to a compounding series of graphical squares. Each level of Gridcosm is made up of nine square images arranged into a 3-by-3 grid. The middle image is a one-third size version of the previous level. Artists add images around that center image until a new 3-by-3 grid is completed, then that level itself shrinks and becomes the "seed" for the next level. This process creates an ever-expanding tunnel of images, the newest level a direct result of the previous level which is a result of the previous level and so on.
Golan Levin is an American new media artist, composer, performer and engineer interested in developing artifacts and events which explore supple new modes of reactive expression.
Bernard Dumaine is a French artist best known for his work in photorealism and surrealism styles and for his background designs for television cartoons. He works in a variety of media, including oil paints, acrylic paints, graphite pencil, digital painting, digital collage, and video.
Zachary Lieberman is an American new media artist, designer, computer programmer, and educator.
Usenet is a worldwide distributed discussion system available on computers. It was developed from the general-purpose Unix-to-Unix Copy (UUCP) dial-up network architecture. Tom Truscott and Jim Ellis conceived the idea in 1979, and it was established in 1980. Users read and post messages to one or more topic categories, known as newsgroups. Usenet resembles a bulletin board system (BBS) in many respects and is the precursor to the Internet forums that have become widely used. Discussions are threaded, as with web forums and BBSs, though posts are stored on the server sequentially.
Tom Corby and Gavin Baily (1970) are two London based artists who work collaboratively using public domain data, climate models, satellite imagery and the Internet. Recent work has focused on climate change and its relationship to technology and has involved collaborations with scientists working at the British Antarctic Survey.
Ars Electronica Linz GmbH is an Austrian cultural, educational and scientific institute active in the field of new media art, founded in Linz in 1979. It is based at the Ars Electronica Center (AEC), which houses the Museum of the Future, in the city of Linz. Ars Electronica's activities focus on the interlinkages between art, technology and society. It runs an annual festival, and manages a multidisciplinary media arts R&D facility known as the Futurelab. It also confers the Prix Ars Electronica awards.
The Meow Wars were an early example of a flame war sent over Usenet which began in 1996 and ended circa 1998. Its participants were known as "Meowers". The war was characterized by posters from one newsgroup "crapflooding", or posting a large volume of nonsense messages, to swamp on-topic communication in other groups. Ultimately, the flame war affected many boards, with Roisin Kiberd writing in Motherboard, a division of Vice, that esoteric Internet vocabulary was created as a result of the Meow Wars.