IIRC, libcrack will happily use any wordlist you give it. I presume the default wordlist includes "password", yes.
As to integrating libcrack in your signup process: if an account at your site isn't actually important, I'm sad to say that you probably shouldn't bother. People who reuse passwords are, sadly, at much more risk from the other sites (if you're even aware of libcrack, you're well ahead of the curve); and a password like 'password' isn't all that bad for something as value-less as gawker.
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IIRC, libcrack will happily use any wordlist you give it. I presume the default wordlist includes "password", yes.
As to integrating libcrack in your signup process: if an account at your site isn't actually important, I'm sad to say that you probably shouldn't bother. People who reuse passwords are, sadly, at much more risk from the other sites (if you're even aware of libcrack, you're well ahead of the curve); and a password like 'password' isn't all that bad for something as value-less as gawker.