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Apple continues tweaking Mountain Lion 10.8.2 with new 12C53 beta build

Just two days after releasing 10.8.2 build 12C50, Apple has released a new 12C53 build. The previous build included release notes, so we know that Apple is finishing up work on the update. 10.8.2 includes features like Facebook integration and phone number/Apple ID syncing for iMessage and FaceTime.

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