Facebook has promised to address complaints it was responsible for wiping email contacts in some users' mobile phone address books, replacing them with @facebook.com listings.
The social network blamed the deletion of users' contacts on a software bug.
The problem followed last week's move to make Facebook's own addresses visible by default on its website, hiding the ones originally listed.
Facebook said it was fixing the issue, promising it "will be resolved soon".
The company was unable to confirm the scale of the bug, but reports by The Verge and CNN Money suggested users who had activated Facebook Contact Sync on Blackberry and Android phones, and devices running the beta versions of Apple's iOS6 and Microsoft's Windows Phone 8 had been affected.
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