@Cherie-and-Bill0
Airbnb does not provide Facebook links for any of its user accounts. It only displays Facebook in the list of its confirmed verifications.
Airbnb's current "cleaning pledge," which you must have signed onto if you're currently accepting bookings, does not indicate any exceptions for vaccinated guests. So until that policy is amended, a host would be in breach of policy if they chose not to do the deep-cleaning based on what they believe their guests' vaccination status to be.
You happen to be in a state that has banned businesses from verifying the vaccination status of individuals, which is just one of many examples of why even if Airbnb had this so-called tickbox, it has too many legal obstacles preventing it from backing up a user's self-reporting with actual verification. So all this little tickbox would mean is that somebody clicked a button - nothing more. How is that useful as information to a host or guest?