It’s Stories, basically the same thing as Instagram stories. I’m not sure if every channel has the option to post, but if you do you hit the upload button at the top and then stories on the bottompic.twitter.com/fEfEW2Mx6K
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