The first new feature offers a simple way to see what's happening on Twitter in relation to you. Just click on the new tab with your @username, and you’ll be able to see which of your Tweets are Favorites, plus the latest Retweets (of your Tweets), Tweets directed to you, and your new Followers.
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The other new feature is the Activity tab. It provides a rich new source of discovery.
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It’s easier than ever to explore Twitter, connect with people, and discover what’s happening around the world.