Spam, spim, spit, comment spam, referrer spam, splogs, software exploits, viruses, worms, phishing, dictionary attacks, cross-site scripting, social engineering: does everything new we do online have its own categories of abuse we have to protect ourselves and our users against? Can anything be done to stop it, or at least to defend ourselves against it? Listen to the experts as they discuss the solutions, for better or for worse.