Mavericks How-to: Block contacts in FaceTime and iMessage on OS X
With the highly anticipated update to Mavericks 10.9.2, users gained the ability to block contacts in FaceTime and iMessage. This has been a long-awaited addition, since iOS 7 received this feature five months ago. If you previously blocked people in iOS 7, the block list syncs over from your iOS devices to your Mac through iCloud. Make sure Documents and Data is turned on in order for that to occur.
Now with Mavericks, you are able to block certain phone numbers from iMessaging or FaceTiming you without needing to get up and grab your iOS device…