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Facebook has been in the news lately, and for many, the news hasn't been good.
Privacy issues continue to be in the news, as Facebook continues to adjust and readjust user privacy settings, requiring users to constantly reassess Facebook privacy policies, settings' options, and how Facebook has changed user settings from prior user choices.
Lately Facebook not only added their own email service, but without consulting their users, unilaterally changed their users' default displayed contact email address to users' new @Facebook.com email address, without so much as a simple notification of the change.
While it's true it's easy to change the default contact address back to the old one, I would ask why that should be necessary, why Facebook would decide to “tamper” with their users' contact address at all, and why Facebook didn't contact a single user, letting them know they made the change, and if not desired, how to revert back to their original address.