Twitter's new hovercard feature.

Twitter officially announced the new feature via their blog. The usefulness of this feature is that you can check out the profile of a person by hovering over their tweets. This means you do not need to leave the page your on to go and check out a person's profile.

Found on their blog

One way we've found these cards to be useful is to find out more about retweeted people and follow them right there. You can also see more information with an expanded view of the card.

Sending direct messages to people you follow will also be possible with Hovercards so you can interact with tweeters without having to move off the page.

Hovercards will be rolled out in stages so not all of you will be seeing them right away. 

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Sociolatte