Apple Lossless Audio CODEC (ALAC), submitted OS X Mavericks within WWDC 2013, and from then until now implemented some new functions in this version of the operating system for Macs sold in Apple Stores. One of them is borrowed from iOS 7 and allows blocking of phone numbers Apple IDof the used for FaceTime si iMessage. iOS 7 Block is the name chosen for the operating system of iDevices, and in OS X Mavericks it works in exactly the same way as in iOS 7, so those who will call/text you will not be able to contact you, and the interesting part is that iCloud synchronizes this blacklist between iDevices/Macs.
Apple released the GM version of OS X Mavericks last night and it is speculated that by the end of the month the final version should be released by the end of this month, somewhere between October 23rd and 25th.
