Wikipedia
Makeoutclub
Makeoutclub.com is widely considered the first niche-audience social network. Launched in 1999 by web designer Gibby Miller, and preceding Friendster, Myspace, and Facebook, Makeoutclub (or MOC) was vital to the early development of profile-based communities, introducing features and concepts (such as user profiles with photos and interests sections) which helped to forge what was later coined "Social Networking".