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One well-known science site recently turned off reader comments due to trolls and spambots. The host of CNET TV show Rumor Has It, who has dealt with her share of online abuse, ponders the move.
Imperva study finds CAPTCHAs, designed to keep spambots off Web sites, can easily be broken by humans and can turn people away if they are difficult or annoying to complete.
Advocates for the visually impaired contend that increasingly popular "visual verification" tests are discriminatory, raising a cloud over the future of a widely used antispam tool.
CNET News.com's Declan McCullagh explains how spammers are hijacking Comcast's network to transform subscriber PCs into spambots.