By DEBORAH GAGE, San Francisco Chronicle

Spam invades My Space, Facebook

Wherever you go on the Web, it seems the riffraff are not far behind.Consider Facebook, the social network started four years ago for Harvard students that has blossomed into a popular hangout for 70 million users.Over the last month, some Facebook members have received messages inviting them to download free ring tones or buy male enhancement drugs.

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Hackers attack search engines

Hackers have turned their attention to search engines in the latest attempt to invade the computers of unsuspecting Web users.

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Volunteers will help investigate online spam

See that pop-up ad? Click on it! You just won the lottery? Well, by all means, e-mail them your contact information to claim your prize.

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'Ethical hackers' train to safeguard online world

Keatron Evans teaches his students to build hacking tools that can invade the computers of unsuspecting users, stealing information, freezing programs and infecting them with invisible viruses.But only if they pledge to use their supercomputing powers for good.

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He bit into some Nigerian spam -- to fight it

Martin Lee knew all the reasons you shouldn't respond to spam e-mails. As a software engineer who studies how to block such messages, he'd warned against answering them himself. But he couldn't resist.

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A powerful new Trojan Horse causing concern

An insidious computer virus recently discovered on digital photo frames has been identified as a powerful new Trojan Horse from China that collects passwords for online games -- and its designers might have larger targets in mind.

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