Turn off Away Notifications

Notifications in Mavericks now appear on your lock screen to show you items that happened while you were away. This new feature can be annoying, especially when you open your MacBook in a meeting, only to see multiple Justin Bieber and Miley Cyrus notifications appear on your screen.

Fortunately, you can correct this by opening System Preferences > Notifications. Here, select an app that supports notifications, and then uncheck the box labeled “Show notifications on lock screen.”