See something or say something; Where people post geotagged photos to Flickr from and geotagged tweets to Twitter from.
Eric Fischer produced a set of striking visualizations mapping Flickr and Twitter against each other. The maps from different cities and areas around the globe depict geotagged photos uploaded to Flickr (orange) versus geotagged tweets to Twitter (blue). In case an image and a tweet originate from the same location, it appears as a white dot. The first image is a map of Europe using the described visualization method, while the second one is a map of New York City.
(Gefunden bei visualcomplexity.com)