I've been using Twitter for over 7 years and I don't understand what this sentence is sayingpic.twitter.com/drAFkuCWSC
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
Hitting "Tweet" and starting with a @ username means everyone sees it. Hitting "Reply" means there's traditional visibility.
Which, yikes, I think they just made it more confusing unless the UI changes drastically to distinguish the two
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