Namechk is a useful site that allows its users to find out if their favorite username or vanity url has been taken on just about every social networking site known to man (80+).
How it works: Go to the site, type your standard Internet moniker, and Namechk will quickly search and find if your “johnnyfortran8″ is available to use on sites such as Facebook, Twitter, Vox and many others.
On the flip side, if you’re in the final stages of erasing your name and presence from the Internet in an attempt to Become Web Dead, you can use the service as a means to verify that you’ve actually wiped clean all of your accounts — even the obligatory services you signed up for in an attempt to get that one piece of information you couldn’t live without. Give it a shot.
*Alternatively: DialUsername offers a similar service, and includes a few sites that Namechk doesn’t.