Ovenden notes that, in 2019, 18.1 million text messages were sent every minute, as well as 87,500 tweets. Wikipedia has five to six thousand hits per second. A California-based digital service, the Wayback Machine, has archived 441 billion websites. “Archiving the datasets created by the big tech companies, such as the advertisements on Facebook, the posts on Twitter, or the ‘invisible’ user data harvested by the adtech companies is one of the major challenges facing the institutions charged with the preservation of knowledge.” – Literary Review