Chat heads is a new way to interact with messages you receive on the social network. The feature allows users to continue what they're doing like browsing the news feed without interruption.
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Users can drag the chat heads and position them wherever they please helping you to focus on what you're doing.
Besides chat heads, Facebook finally introduced its redesigned news feed and timeline for profiles.
To get the update head over to the App Store app and update your app as you would any other.