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Usernamecheck.com

By: Going Like Sixty - Published: Oct 15, 2008 • References: usernamecheck
Would you like to know if your personal brand - your username - is registered at all the cool web services, like email, social networks and blogs? Usernamecheck.com does it for you.

66 Sites are listed on the page with more being added on a regular basis. It lets you leave a trail so people can instantly recognize you across the web, so you can easily build your web presence and personal brand.

It’s not foolproof, some of the sites show “available” when they aren’t, but it's nice for an overview.