In the past, .co domains were used for the country of Columbia. Recently, domain registrars like GoDaddy have begun pushing them to webmasters and business owners from all countries as an alternative to .com. If you’re wondering whether a .co domain will rank well on Google, the answer is, “yes.” Major companies like Overstock.com have even started using .co in their traditional advertising and marketing (go to O.co as a shortcut to Overstock.com); however, .co domains don’t seem to get the same weight that .com domains get, so if you’re a small business you should definitely first try to get a .com address.