Battling Web spam - Part 1

IBM developerWorks: "Spam on the Web is one of the biggest threats to a modern Web developer. The "bad guys" become more and more sophisticated every year in how to vandalize and proliferate ads over any Web 2.0 page they can grasp. To make matters worse, spam is increasingly used to distribute malware. The arms race is on, and Web developers need to know what basic tools are available to battle spam on their Web sites. This two-part installment provides a thorough guide to anti-spam techniques. This first article explains how to assess whether a visitor is a spammer and how to organize site workflow to discourage spam."

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