I received this issue via an E-mail from a guy regarding different datacenters and different SERPs result. So, the question goes like

“it looks like google shows different results depending on where the user is from. Even when using the same google.com link and entering keyword in English”

Nice question, Infact I had this same issue with my results as well, I used a proxy to determine what result I’m getting from different datacenter and been using different tools to find that out, I was getting different results on Google.com than from Google.ca even after using those tools and a proxy.

Interesting? You might have heard of this “google use different results on different datacenters and different locations” – Yes, this is partly true. However, there are people completely confused about their results in different datacenters. In my assumption this could be due to (you can call this a change or a new thing in Google’s algorithm) google not only want localized ‘better results’, they are making it harder for their results to be abused.

There are few tricks to avoid this to happen:

1.log out of your gmail, any google accounts.
2.Stop using proxy everytime.
3.Use google Webmaster Account to set the geo targeted location for your website

Also, here is how to use SERPs result from USA:

For example, if you are searching for “widget” input http://www.google.com/search?hl=en&gl=us&q=widget+widget2&btnG=Search

?hl=en - tells you the results to be in English (interface only, not the results!)
&gl=us - sets google Local results for usA

&q=widget+widget2 - this is your widget phrase, (adds a plus sign instead of free space in between widget 1 and widget 2 keywords)

&btnG=Search - confirms you clicked on google Search button

You should be able to see your SERPs:

http://www.google.com/search?hl=en&gl=us&q=widget&btnG=Search – for USA
http://www.google.com/search?hl=en&gl=UK&q=widget&btnG=Search - for UK

Furthermore, I found out people outside USA using Google.com shows a different set of result than people from USA using Google.com, please stop saying “Google.com” is the main datacenter used in the world. I hate to hear that, just because you see your keyword ranked top ten does not means it is the same for everyone.

I recently received a comment from an SEO saying “Your keyword “SEO Guru” is ranked different on a US datacenter and showing a different result of Pakistan datacentre”, my reply would be I suspect this to be beyond the “geographic boundaries”, it takes a lot of factor – you can’t get first page on every datacenters, unless you have some really strong trust with Google and your website is 5+ old, also – please remember “Competition is greater in the US” than in other datacenters.

Any idea? Any questions? Feel free to contact me or comment.