How can I find stats and information about Foursquare usage? I am looking for the place in the US where Foursquare is most popular.
With a little googling I couldn't easily find any good stats. However, the most popular venues seem to be transport hubs—particularly airports—and the US is the country where Foursquare has the most users... So I came up with this worldwide top 10 list:
I checked this against a list of busiest airports and I'd guess these venues indeed are among the ones with most checkins.
If I missed something, leave a comment, or update the list yourself!
Out of curiosity, I also gathered a list of top 10 most popular venues in European Union:
Again, I probably overlooked some popular places, so feel free to edit.
Compared to population, the Netherlands, Finland, and Denmark seem to be over-represented in Foursquare use, while hugely busy spots like Charles de Gaulle Airport (73k), Eiffel Tower (53k), or Piccadilly Circus (38k) have relatively few check-ins. Also, in EU the list is not completely dominated by airports. Fastest climber in last year was Helsinki airport, along with other Helsinki venues.
It groups checkins by city, and within each city you can easily see most popular venues, optionally filtering them by category. Examples: