Nope, had one, never really used it and deleted it when I realised that it was possible to do that (because one never used to be able to delete an account, just 'deactivate' it).
Not really as Lysander has already stated it's a poll to determine account ownership not useThere should be a choice "I have a facebook account but rarely use it"
This is in no way an accurate reflection of my facebook account ownership status.