Twitter just introduced a new feature (not for everyone yet) that allows you to view other people profile without actually visiting their profile.
As always, Twitter wants to enhance the user experience by developing tools and features that make it more usable.
Hovercards are cards which appear when you hover over a username or avatar. The cards display additional information about the person and allow you to interact with them while staying within the context of your page. Twitter Blog

Once your hover over the members profile, you will see his/her information and also be able to add, block, send a message or follow instantly. More convienient ha?

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