If one looks at the graph, 20% of sites were dead in 3 years. This isn't a facebook thing, most facebook migration happened a decade ago. Instead this is comp

If one looks at the graph, 20% of sites were dead in 3 years. This isn't a facebook thing, most facebook migration happened a decade ago. Instead this is companies closing, campaign websites shuttering, urls being changed, community events being over, and so on.