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Image representing KnowEm as depicted in Crunc...

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Knowen is a site that lets you search many sites at one time to find out if a username is in use. There are other sites (NameChk, NameCheck, UserNameCheck, etc) that offer a similar service, but Knowem seems more comprehensive and divides the sites into categories. If you don’t agree or have a better method, please let me know in the comments.


namechk (Photo credit: g_vondewall)

NameChk seems to be the fastest.

Both sites also show which domains are available for the chosen name.

Knowem also provides free profiles and paid premium services.