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Gatekeeper protects your Mac
A major new Mac security feature, Gatekeeper helps you keep your Mac safe from malware with options to only download software from Apple-approved developers and third-party apps with an Apple Developer ID.
Tweet from any supported app without having to switch applications. The interface is much like Twitter integration for iOS.
FaceTime directly from Message
Sometimes text doesn't get your point across. Quickly switch to FaceTime to have a face-to-face conversation straight from Message with a friend on a supported Mac or iOS device.