I recently sold my MacBook Air, and I deauthorized iTunes, wiped the hard drive, and reinstalled snow leopard (the os version that came installed with the MBA).
I stumbled upon this shortly after, which made me very nervous since I didn't do it.
This is what I didn't do:
Turn off Find My Mac and sign out of iCloud
To turn off the iCloud service on your Mac:
Choose System Preferences > iCloud. Deselect Find My Mac to disconnect your devices from iCloud. Click the Sign Out button on the left side. The system automatically removes iCloud data from all of your devices.
How nervous about this should I be? Also, is there anything I can do now that the computer is not in my possession?