KnowEm is a great service that lets you find and check a specific username for availability on multiple Social Media websites like Imageshack, Tumblr, Twitter, Youtube, Blogger, Stumbleupon, Digg, Multiply, Plurk and so much more. It’s so simple to use and no registration/sign-ups needed. Just enter your brand name, user name or vanity URL and it will do the job of checking its availability on 120 popular Social Media websites. It will show you all the available websites where you can register with that name, saving a lot of time on your part.

Visit the Official Site: KnowEm