Map geek extraordinaire Eric Fischer is back, mapping out who Tweets (in blue), who Flickrs (in red), who does both (in white) and where — from New York City to Tokyo to Amsterdam to Moscow and on — for his new project See Something or Say Something. See it city by city below.

The resulting clusters of light settle into geometrical grids and burst like supernovas. Ooh! Ahh! Informative! Tokyo prefers Twitter, San Francisco favors Flickr and Manhattan is ablaze with social media exhibitionism.