This ushered in a new era in linguistic study, one that is enthusiastically analyzing and codifying the rules of informal speech, the spread of vernacular, and the regional, racial and class markers of different kinds of speech:
https://memex.craphound.com/2019/07/24/because-internet-the-new-linguistics-of-informal-english/
The people whose speech is scraped and analyzed this way are often unreachable (anonymous or pseudonymous) or impractical to reach (because there's millions of them).
4/