Twitter is working on floating notifications for replies and direct messages that pop up at the top of your screen when you scroll through the app. While the cards have a custom blue-ish tone to them, they don't add any extra functionality like those provided by Android itself do, such as "reply," "mute," "like," etc. Instead, they replace system notifications altogether when they pop up, so depending on your workflow, this might be the greatest thing ever or the worst possible decision.
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