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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: 16 June, 2011, 23:08 PM
Liked On: 16 June, 2011, 23:07 PM
Liked On: 14 June, 2011, 16:13 PM