Probably a very noob question this ...
I'm based in the UK and have just set up a campaign which includes Google US. There seems to be a discrepancy between some of the rankings found by SEOMOZ and what I see when I simulate the actual search using Adwords > Ad Preview.
For example, a particular term shows "not in the top 50" for Google US on the rankings page of my campaign in SEOMOZ. But my US colleagues say that when they run the search they see us on page 1. And when I simulate the search via Adwords Preview, I also see our site ranking well on page 1.
I'd like to understand why the discrepancy 
Thanks for any advice.
Gord
