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Thanks. Got your point. You suggest it should be same as the format used in your site not what Google indexed. Hopefully, Google is taking care of silly canonicalization !!

Points noted. I am targeting users continent wise. 1)North America 2)Europe,Australia 3)Rest Hopefully,that will reduce the border overlap problem.(?) I do not mind 1 and 2 be mixed just 3 has to be separate due to my business model and vast Purchasing power parity difference. Will the error be less than 10-15% seeing the above conditions? Any best practices to minimize? I appreciate your time,Ryan.

Thanks for the answer. I have got some Joomla and wordpress experience. This time I am going for custom development in .NET for scalability purposes.How does these things are taken care of in custom development?

For one of my sites comparing to google webmaster tools on a page that has been established for over a year webmaster tools lists 30000 links and opensite explorer lists about 3333 links so about 11% though i doubt it will be 11% for all sites as there could be many factors involved in this effect. number of linking domains is about 90% of what it says in webmaster tools. hope this helps