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In its fight to deter spammers, the social network gets tool provider TweetAdder to agree to a strict settlement regarding Twitter's terms of service.
A previous version of this story stated all versions could no longer be used with Twitter. Certain versions of TweetAdder can be used with Twitter.
Twitter is on the offensive against websites it accuses of bombarding users with spam.
The social-networking site is working to shut down five popular spam tool providers by suing them in federal court.