After installing/upgrading 'Pidgin protocols plugin for Conversations and
Contacts 0.8' for Nokia's N900 Maemo. It generated a new contact in Contacts whenever someone on Facebook goes online. After merging this Facebook contact to an existing contact in address book, by going offline or disable Facebook account, then going online again, the merged contacts continue to show as a new contacts and have to be merge again.
*** Bug 26455 has been marked as a duplicate of this bug. ***
Reassigning to m5-account-plugins, but this is probably a bug in the Maemo address book. It happens for protocols other than Facebook, too. Let's CC a pet abook hacker!