The 4 o'clock spot is a Master button (for savingsettings and quickly returning the center dial to its main volume control), and 6 o'clock features a half-dozen blocks that correspond to your virtual surround speakers.
No matter how many privacy settings you set on your online profile, there are no settings that allow Facebook itself from viewing it, or saving it in an ever-growing database.
It's also more closely tied to the cloud, saving documents to Microsoft's SkyDrive storage system by default, so your documents and personal settings are remotely accessible.
Study after study shows that the sooner children begin to learn in these high-quality settings, the better he or she does down the road, and we all end up saving money.