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.co is treated by Google as an 'international' domain rather than just a TLD for Columbia. As far as i'm aware the .co doesn't have a keyword boost at the moment.
Liked On: 17 June, 2011, 00:08 AM
Liked On: 17 June, 2011, 00:07 AM
Liked On: 14 June, 2011, 17:13 PM