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I too have had problems with this spammer, and seems to use the same MO and names on different sites, if you search, there are a number of options to block, Protector does well, combine it with
"do not allow user to change email" (prevents spammers from registering under one email, getting the activation email and then changing to a non-existant email),
never allow comments to be always approved with admin review,
and I save the protector logs, then look at IP addresses used most frequently, you will find IP from Czech republic, Uraguay, Russia, Korea to be the source of 99% of spam - I then just block those ranges entirely..net result seems to be virtual 100% elimination of posted/visible spam.
The spammers seem to be just posting URLs - my take is that they are trying to boost the Google rankings of certain sites by posting their URL on many other sites.