Thanks, VTGirl! Great information! Here is the answer to your question:
The Early Years
According to the definition above,
the first recognizable social network site launched in 1997.
SixDegrees.com allowed users to create profiles, list their Friends and, beginning in 1998, surf the Friends lists. Each of these features existed in some form before SixDegrees, of course. Profiles existed on most major dating sites and many community sites. AIM and ICQ buddy lists supported lists of Friends, although those Friends were not visible to others. Classmates.com allowed people to affiliate with their high school or college and surf the network for others who were also affiliated, but users could not create profiles or list Friends until years later. SixDegrees was the first to combine these features.
From 1997 to 2001, a number of community tools began supporting various combinations of profiles and publicly articulated
Friends. AsianAvenue, BlackPlanet, and MiGente allowed users to create personal, professional, and dating profiles—users could identify Friends on their personal profiles without seeking approval for those connections (O. Wasow, personal communication, August 16, 2007). Likewise, shortly after its launch in
1999, LiveJournal listed one-directional connections on user pages. LiveJournal's creator suspects that he fashioned these Friends after instant messaging buddy lists (B. Fitzpatrick, personal communication, June 15, 2007)
http://jcmc.indiana.edu/vol13/issue1/boyd.ellison.html (Bolded by me)
CompuServe and AOL came into play long before that tho.
CompuServe, (CompuServe Information Service, also known by its acronym CIS), was the first major commercial online service in the United States. It dominated the field during the 1980s and remained a major player through the mid-1990s, when it was sidelined by the rise of information services such as AOL that charged monthly subscriptions rather than hourly rates.
CompuServe was founded in 1969 as Compu-Serv Network, Inc. (the earliest advertising show the name with initial caps) in Columbus, Ohio as a subsidiary of Golden United Corporation.
http://en.wikipedia.org/wiki/CompuServe
AOL: Kimsey changed the company's strategy, and in 1985 launched a dedicated online service for Commodore 64 and 128 computers, originally called Quantum Link ("Q-Link" for short).
http://en.wikipedia.org/wiki/AOL