Another worm attack early Monday on Twitter kept the micro-blogging Web service chasing down infected accounts and deleting rogue tweets.

"Late Sunday night and into the wee hours of Monday we fought off a fourth attack," said Biz Stone, co-founder of Twitter, in an update to a blog post he originally published Sunday. "Once again, we secured the compromised accounts and deleted any material that would further propagate the worm."

The newest attack -- which followed a pair of worms Saturday and a third Sunday -- originated from a just-registered account labeled "cleaningUpMikey," said F-Secure Corp.'s chief research officer, Mikko Hypponen. Today's copycat worm infected account profiles of people who clicked on the sender's name or image in tweets like, "How TO remove new Mikeyy worm! RT!! http://bit.ly/yCL1S."

More: http://www.pcworld.com/article/163063/article.html?tk=nl_dnxnws