Its always tough to remember a different user name for each service you use on the web . I signed up for a lot of services and most of the times I retrieve my username by forgot password link on websites .
I found a good service which checks whether your username is available in all the services in one click so that you can select a common username for all services and shows you the result on a single page .The service is
Currently it checks in 68 different services across the web in a couple of minutes and lets you know whether your username is available or not as shown in the figure.
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