If you are dying to find out exactly where your user name can be used without modification, Namechk provides a free and very easy way to do it, quickly and through a whole lot of different social networking sites.

I tested Namechk using a variety of user names and found that the speed largely depended on the popularity of the name. Names that are largely unused returned extremely quickly, while commonly used names took a little longer; though never longer than about ten seconds.

If you have a rather obscure default user name, it also provides a quick and easy way to check what names you have registered where. [CNET via Lifehacker]

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