No, I never go to Google personally, I just guess. 
A few times I have gone to Google after guessing all 5 photos, as I have been convinced that a particular photograph isn't from when it says it is. I have been right a few times too. One was flagged up as 1936 on here the other day, and several sources on the internet/Google said it was 1916-1917. It doesn't happen often, but it has happened a few times.