zzb.bz is a URL shortening site that, unfortunately, is very heavily abused by spammers. There is no formal way to report abuse, but in my experience the owner of the site has been very responsive when contacted by Twitter, and has acted quickly to remove spam links and blacklist known abusive domains. However, it appears that the site may be a one-man operation, so he struggles to keep up with the automated tools used by spam gangs.
You can find links to the creator's Twitter and Facebook profiles at the foot of his homepage on http://roga.tw/. Please be polite and helpful when reporting abuse.