The Harvard Center for Geographic Analysis(CGA) has been harvesting geo-tweets since late 2012. "Geotweets” are tweets which contain a pair of geographic coordinates from the originating device which denote the location where the tweet was created. Approximately 1-2% of tweets are geo-tweets. Perhaps roughly 1 million per day are created. The CGA is attempting to harvest these tweets which it stores as CSV files on a hard drive. The tweets can be manually extracted upon request and the tweet IDs made available which can be rehydrated and turned back into full tweets. Contact worldmap@harvard.edu for more information.