I just listened to an interesting episode of 99% Invisible podcast about Enron email corpus (You’ve got Enron mail). Apparently sometime around 2000 a mass group of Enron emails were released to the public (which included some private emails of employees). This corpus of some 600, 000 emails was then used by researchers to study communication among real people and many technologies we use today (Siri, spam filters, etc) are based on those. The podcast hosts also explore some interesting questions like whether they should have been released at all (apparently a privacy concerns were not a big thing then) and what happens when so much of our technology today is based on the writing of the employees of a fallen energy company.
Link to this episode: https://99percentinvisible.org/episode/youve-got-enron-mail/