There are over 5,000 subreddits with plenty of overlap and similarities. Randy Olson graphed them based on link activity and users and put them in an interactive. The overall view isn’t that useful (other than easily spotting the My Little Pony-themed outlier cluster in the top right), but if you use reddit and are familiar with the territory, it can be fun to browse.
Network of subreddits
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Where Your Job is Most Popular
Some jobs are common nationwide, because they are needed everywhere. Others are more specific to geography. See where job falls on the spectrum.
Where to Find Jeopardy! Daily Doubles
Placement of Daily Double clues, from season 1 to 31. Watch them play out.
How Airbnb Visitors Rate Location in Major US Cities
This is how Airbnb visitors judge location, which provides a view into where city centers begin and end.