It turns out that the @facebook E-Mail addresses have been pushed to the contact info on all mobile devices, too, which means that the default E-Mail address on your phone of your friends might not be the one you tend to send mails to. Unfortunately, at this point, all you can do is change your own settings on Facebook, and pay attention while composing on your mobile device. As CNET reports, quite a few people have already reported their address books having been altered and E-Mails having been lost (they didn’t make it to the recipients Facebook messages either).
Facebook has got to really answer for this mess. It’s one thing to change a user’s default E-Mail on their own site (which itself shouldn’t happen, since we’ve explicitly set it to something else), and quite another to alter the address books of millions of people. Fortunately for those on ICS, the app doesn’t sync contacts yet on the platform.
[via CNET]