Phys.org: “What does your Twitter profile reveal about you? More than you know, according to Chris Weidemann. The GIST master’s student has developed an application that follows geospatial footprints.
You start your day at your favorite breakfast spot. When your order of strawberry waffles with extra whipped cream arrives, it’s too delectable not to share with your Twitter followers. You snap a photo with your smartphone and hit send. Then, it’s time to hit the books.
You tweet your friends that you’ll be at the library on campus. Later that day, palm trees silhouette a neon-pink sunset. You can’t resist. You tweet a picture with the hashtag #ILoveLA.
You may not realize that when you tweet those breezy updates and photos of food, you are sharing information about your location.
Chris Weidemann, a graduate student in the Geographic Information Science and Technology (GIST) online master’s program at USC Dornsife, investigated just how much public geospatial data was generated by Twitter users and how their information—available through Twitter’s application programming interface (API)—could potentially be used by third parties. His study was published June 2013 in the International Journal of Geoinformatics…
Twitter has approximately 500 million active users, and reports show that 6 percent of users opt-in to allow the platform to broadcast their location using global positioning technology with each tweet they post. That’s about 30 million people sending geo-tagged data out into the Twitterverse. In their tweets, people can choose whether their information is displayed as a city and state, an address or pinpoint their precise latitude and longitude.
That’s only part of their geospatial footprint. Information contained in a post may reveal a user’s location. Depending upon how the account is set up, profiles may include details about their hometown, time zone and language.”