Facebook has made clear that users can reverse the switch and restore their previously listed email as a default address.

WSJ: Facebook's Email Change Riles Users

However, the privacy mode requires a separate mail and address book app designed by Fujitsu, rather than the default email program and address book provided by the carrier.

WSJ: Japan's Philanderers Stay Faithful to Their 'Infidelity Phones'

You can select a destination in a few ways, speaking the address being the default.

ENGADGET: Living with Google Glass, Day Two: Around the House

The agreement would ostensibly take care of Greece's current debt problems, enabling it to address its longer-term issues and ultimately avoid default.

FORBES: The Greek Debt Crisis

By default, it works with your Apple ID e-mail address, but you can add as many as you'd like from the settings application after verifying that you do indeed own the account.

ENGADGET: Apple iOS 5 hands-on preview

Another Google-dodging feature in the new browser: Highlighting a street address on a Web page launches a map, with the default set to Microsoft's Live Maps (though you can change this default to Google Maps).

FORBES: Magazine Article

And presented with that fact, we have, with great focus, worked with and negotiated with Congress to try to get a deal that ensures that we do not default, that we maintain the full faith and credit of the United States government, and that we address the need to reduce our deficits and get our debt under control.

WHITEHOUSE: Press Briefing