Sometimes the 'liked' tweets pushed into the TL are pretty clutch.pic.twitter.com/JjKeNUASDL
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
I suspect it's very good for user onboarding/retention. The discovery learning curve on here is steep before the app becomes awesome.