Windows 7: New Free Service Filters Twitter Spam.

Researchers recently launched a free spam-filtering service for Twitter that flags offenders for the microblogging service, which, in turn, removes the offending accounts.

The Spamdetector service crawls Twitter, using heuristics to detect spam accounts. Gianluca Stringhini, the researcher heading up the service, says the tool has a low false-positive rate.
"Around a year ago, we started observing these [social] networks, looking for malicious traffic...spammers show a very different behavior compared to real users, and therefore we were able to build a system that can detect them in a reliable way," says Stringhini, a researcher at the University of California-Santa Barbara.