The thing to remember is that data sets are fetched and ordered at the time of the query. Different parameters, thresholds, etc. for the different DC's will cause this. Don't assume the exact same processes are at work across the board.

The place you want to be #1 is what is live at the time and place of the query. Afterall, this is what the searcher sees. It's also what makes SERP watching and reporting difficult.

Dave

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