Agree about social networking -- it was around in early forms, soon after the web launched: PlanetAll.com (1996; acq by Amazon for $100mm in 1998) and SixDegree

Agree about social networking -- it was around in early forms, soon after the web launched: PlanetAll.com (1996; acq by Amazon for $100mm in 1998) and SixDegrees.com (1997; acq for $125mm in 2000).