Source: https://old.reddit.com/r/MapPorn/comments/1i611hm/americas_digital_dialects_how_reddit_reveals_the/

From the author:

"Hi, everyone—This map is based on my 2024 Linguistics PhD dissertation, A geographic analysis of lexical variation in North American English using Reddit corpora. (You can read it here.)

For this project, I extracted huge amounts of text data from top-ranked posts for subreddits dedicated to cities in the US, Canada, and Britain (although my project focused on North America). From each subreddit, I counted the usages of particular synonymous word pairs, like cute and adorable, or forest and woodland. I then calculated the ratio between the two words in each pair for each city subreddit. With each city subreddit corresponding to a real-world geographic location, I was able to run statistics to identify regional clustering in the usage of each word pair, and aggregate the overall patterns. This map shows the groupings of cities in the US that emerged from that analysis.

During my time as a grad student, I taught a course on the history of the English language for several years, and one of my favorite topics to cover was variation in American English. So when I did a dissertation project that combined linguistics, social media, and geography, I knew that I wanted to share my findings with others in order to promote engagement with linguistics and maybe help spark someone’s interest in language.

I have a Twitter thread up where I talk a bit more about the project, and I also have some slides on my personal website where I go into more detail about the methods and findings. You can also find maps of results for some of the individual variables on this page of my website."