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Geotagged tweets and other forms of social media volunteered geographic information (VGI) are becoming increasingly critical to many applications and scientific studies. An important assumption underlying much of this research is that social media VGI is "local", or that its geotags correspond closely with the general home locations of its contributors. We demonstrate through a study on three separate social media communities (Twitter, Flickr, Swarm) that this localness assumption holds in onlydoi:10.1145/2858036.2858122 dblp:conf/chi/JohnsonSSH16 fatcat:aitokdwbovc2hfu6p6bctxvmry