Ideally, your brand has the same name across all of the social sites you use, and, it matches your domain name (for example, we’re mashable.com, twitter.com/mashable, and facebook.com/mashable).
Realizing this fact, popular domain registrar GoDaddy has integrated Twitter registration into its domain manager, allowing you to see if the Twitter username that matches your URL is available, and if so, register it.
The target here is GoDaddy’s small business users. The company explains in the tool that you can “Join today and start "tweeting" about your next sale, when you've updated pictures on your site, or other things that may be going on with you or your business.”
To use the feature, just login to your GoDaddy account and click on any of your domain names to access the manager (where you also go to do things like update name servers). There’s now a Twitter option under “Domain Enhancements” from which you can check your username availability.