A simple service that might nonetheless come in handy sometime, the suitably-titled UsernameCheck will let you find out where is your username registered in a more or less instant way.
The programmer himself claims that he concocted this service to answer a recurrent question: “Do I have my username registered across every site that I should?”.
That is a valid question, because how would you feel if the next Internet humiliation that comes along happens to share the same username that you have been using since the dawn of the web? That would mean that all of a sudden you will be bombarded with e-mails asking “Is that you?”, and your credibility has gone out the window.
This site, then, will let you check where you username is registered just by supplying it and hitting the “check” button. A service by service rundown is then carried out, and you will then find out whether your back is covered or not.
UsernameCheck.com In Their Own Words
“This site is a quick and dirty solution to a question that I often lay awake at night worrying about. Do I have my username registered across every site that I should? What if the next internet humiliation meme just happens to share the username I’ve been using for years, and suddenly people are emailing me asking ‘hey, is this you ???’. The site is simple. I have a stack of web app urls, the application pings the site using the username you want to check, if it returns a ‘no user name’ error we return that. The site uses Dojo as it does all the checks using Ajax (each check takes a couple of seconds so using Ajax you don’t have to sit and wait 3 minutes for the page to load).”
Why UsernameCheck.com It Might Be A Killer
It is a practical service that is rendered at no cost at all.
Some Questions About UsernameCheck.com
How long does the entire checking process take? 
