Also, does the location info purely say "Christchurch, New Zealand" or is it more granular? I'm guessing that when facebook only has sparse information about yo

Also, does the location info purely say "Christchurch, New Zealand" or is it more granular? I'm guessing that when facebook only has sparse information about your location, as in your case, it "zooms out" to the city, state, country etc, but the more information it can collate, the more accurate the suggestion it gives is.