It describes the importance of being about to retrieve data from the internet, and gives some worrying examples of people trying to retract important information.
It's also about link rot, reference rot, and how these problems plague the world of legal research. There are a couple of enterprises under-way ( e.g. Perma.cc) to make link rot a thing of the past, which you might want to investigate before you cite webpages in your assignments.
I recommend you give it a read.
Jill Lepore "The Cobweb: Can the internet be archived?" (27 January 2014) The New Yorker