"Everyone who participates constructively in Facebook should feel confident that we are fighting hard to protect you against spam and other online nuisances," Max Kelly, Facebook's director of security, wrote Monday on the company's blog. Efforts to reach Guerbuez for comment on Monday were unsuccessful. The case against Guerbuez and his business, Atlantis Blue Capital, illustrates how Internet rogues can manipulate Facebook's communications system to unleash massive marketing blitzes.