@TeamYouTube What is this new feature


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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
Thanks for waiting. If you're referring to the Library Tab, it's where you can add playlists that you've created, playlists that other Creators have made and videos you've added to Watch Later to Library to find and view them later.