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Facebook is under an attack of the worms similar to the MyDoom worm, rendered into an image above, that became the fastest spreading email worm ever in 2004. In recent days, thousands of users have fallen prey to at least two strains of malicious code that once downloaded onto a users computer, steal that user's Facebook username and password in order to spread itself via false links posted to friends' messages boards. Facebook security chief Max Kelly writes on the company blog that after a night of work, his team "identified and blocked the ability to link to the malicious websites from anywhere on Facebook." Security firm Sophos, which of course makes a living scaring people, says the threat isn't over. "If workers are allowed to be given access to these sites," goes Sophos "analyst" Graham Cluley's pitch,"then it's vital that they do not put their personal and corporate data at risk, and are protected from web-based infections."