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I found this out a few days ago. Needless to say, I was pretty annoyed.
Read more at:Facebook's new unified e-mail and its implementation is causing unwanted changes to users' address books; worse, the changes have gone unnoticed by users and vital communication is being lost.
Facebook e-mail mess: Address books altered; e-mail lost | Internet & Media - CNET News
I found this out a few days ago. Needless to say, I was pretty annoyed.