FROM PC WORLD :
Web sites such as Twitter are becoming increasingly favored by hackers as places to plant malicious software in order to infect computers, according to a new study covering Web application security vulnerabilities.
Social-networking sites were the most commonly targeted vertical market according to a study of hacking episodes in the first half of the year. The study is part of the latest Web Hacking Incidents Database (WHID) report, released on Monday. In 2008, government and law enforcement sites were the most hit vertical.
Social networks are "a target-rich environment if you count the number of users there," said Ryan Barnett, director of application security research for Breach Security, one of the report's sponsors, which also includes the Web Application Security Consortium.
Twitter has been attacked by several worms, and other social-networking platforms such as MySpace and Facebook have also been used to distribute malware. That's often done when an infected computer begins posting links on social-networking sites to other Web sites rigged with malicious software. Users click on the links since they trust their friends who posted the links, not knowing their friend has been hacked.
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