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However I am in based in Ireland. The bulk of the site users are UK or USA based. Are users seeing ads that I am not because of the likelihood that many of the advertisers are not adding Ireland to their countries list?
It seems the answer is likely yes, which is a bit disconcerting as it means I have no real idea what ads are being run at the site.
I'm not sure if this conclusively proves that there are regional differences, as they seem to be playing with the algorithm at the moment and that could have caused the different results.
It could also have been due to my ISP's cache.
I had a friend in the USA check it for me and she sees ads I have never seen, so it would seem the answer is that they are served in accordance with the regional settings.
She saw some that had I known they were there I would have blocked, but I won't for now anyway, they are earning too much to do so and their presence does not seem to have affected sales from our site at all.