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Security experts say that the measure is a positive one, especially in light of the threats directed at the site, but that it's "clearly still in development."
Like the first worm, the second "Mikeyy" worm posts unwanted messages on users' Twitter pages, some of which taunt the micro-blogging site to fix its security.
The Brooklyn, N.Y., teenager who takes credit for a series of worms on Twitter gets hired by Web app development firm, and then distributes another worm.
Security experts say be careful who you follow on Twitter, after worm attacks leave some users with infected profiles.