I was one of the first participants on the thread since the beginning but I've been absent from this thread for a couple months due to life. I'm discouraged to hear all the chatter about (new) rules.
From what I'm putting together here, unless you've been to a specific location and recognize it, you aren't going to identify it. When someone posts a picture of a field somewhere in Asia or a mountain somewhere west of the Mississippi and you aren't supposed to look up any hints or clues, this is going to be tricky.
Originally the biggest no-no on the thread was, don't right click a picture and select "Search Google for Image". Other than that, various clues were given and people used whatever resources to solve the picture. Any building signage, license plates, landmarks - I say look them up. Otherwise if you've never been there...you won't know the place.
If we're going to ban all types of internet searches...we may as well only post skylines of cities with an identifiable skyline and a populations over 100,000 people. In which case, the thread has pretty much covered every city.