If you're looking to learn Redis, I recommend http://pluralsight.com/training/Courses/TableOfContents/building-nosql-apps-redis … by @jsonmez and https://github.com/karlseguin/the-little-redis-book … by @karlseguin
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more