These stunning maps were made entirely from geotagged tweetsS

Twitter has compiled a series of maps showing geo-located Tweet volumes since 2009. The resulting maps are intricate, gorgeous — and even a bit revealing.

According to Miguel Rios, Twitter's Visual Insights Manager, billions of tweets were used to put these maps together. Every dot is a tweet, and the colors represent tweet volume.

What's particularly fascinating is how the coastlines and transportation conduits — including those on the ocean — are so clearly demarcated. It's also interesting to see those regions that are either low density, inaccessible — or even off the grid. There may also be selectional effects at play here as the maps were compiled exclusively from geotags; population density does not necessarily correlate to tweet density. Nor is twitter used to the same degree in different parts of the world.

These stunning maps were made entirely from geotagged tweetsS

Europe

These stunning maps were made entirely from geotagged tweetsS

North America

These stunning maps were made entirely from geotagged tweetsS

San Francisco

These stunning maps were made entirely from geotagged tweetsS

New York City

These stunning maps were made entirely from geotagged tweetsS

Tokyo

These stunning maps were made entirely from geotagged tweetsS

Seattle

These stunning maps were made entirely from geotagged tweetsS

Boston

These stunning maps were made entirely from geotagged tweetsS

Moscow

These stunning maps were made entirely from geotagged tweetsS

Seoul

More at Twitter's Flickr site.