To get expertise you need to have experience. To get experience: 1. Try things on your own 2. Partner with others 3. Work for others
those are all just independent options. You can choose one, or all. ;)
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
those are all just independent options. You can choose one, or all. ;)