A service I offer is clients and service professionals is a branding service. Here’s a great resource that I’ve been using to do that which I believe many will find useful.
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You can use it to check whether your desired username is available across a wide range of popular social networking platforms – over 100 at least.

You can use it as a great service offering when you’re planning to help businesses establish their brand, their business identity or when you’re helping them target social networks.

The great thing about this powerful online app is that it tells you instantly where your username or your desired brand URL is being used by someone else and where it’s otherwise currently available.

Use it yourself or use it to make adjustments and plan accordingly prior to taking that essential first step toward attaining consistency in your brand or the brand of your business clients.