From Technology Review…

Ever since Facebook opened its doors to third-party applications a year and a half ago, millions of users have employed miniature applications to play games, share movie and song recommendations, and even “zombie-bite” their friends. But as the popularity of third-party applications has grown, computer-security researchers have also begun worrying about ways that social-networking applications could be misused. The same thing that makes social networking such an effective way to distribute applications–deep access to a user’s networks of friends and acquaintances–could perhaps make it an ideal way to distribute malicious code…

Interesting article. I’ve been wondering about this ever since Facebook apps arrived.