Facebook has good chances of taking over the social web for the same reason Microsoft took over the desktop 15 years ago: they target the non-technical majority of the population. Techies usually demand more transparency, flexibility, quality and minimalism, while non-techies, paradoxically, generally fall for interfaces with lesser degrees of freedom, which makes them more comfortable with it. Less freedom translates to "ease of use" for non-techies.
This is why Facebook somewhat intuitively reminds Windows and will most likely share its faith - not exactly dominance, but pretty close to it.
This is why Facebook somewhat intuitively reminds Windows and will most likely share its faith - not exactly dominance, but pretty close to it.