Apple plans to fuse basic Facebook functionality into the core operating system of its next-generation iPhone expected this summer, according to hackers who have dismantled the OS. The new functionality is said to include the ability to integrate your Facebook contacts into the iPhone's address book; use Facebook profile pictures for your iPhone contacts; and sync Facebook Events with your calendar. Hackers recently discovered the rumored features on a jailbroken iPhone running iPhone OS 4.0, the new iPhone OS was released earlier this month as a developer preview.