We need to do something about this. Using the user for displayin g"Annotation Deleted." is plain wrong. This field stores a valid user identifier. I have chosen to go with "acct:" to capture a "user@provider" form while explicitly denying any guarantee that such an email user exists (it is merely an account at an identity provider, not an email address). But "acct:Annotation deleted.@hypothes.is" is most certainly *not* a real account. I would suggest to removing the user entirely. Discuss on dev@ if that presents some nasty problems with the store or other code. Our annotation template can probably be made to conditionally show a user and not rely on it existing.