clipped from: www.readwriteweb.com 
A report on BBC's technology program, Click, has exposed yet another security flaw in Facebook - one that could comprise users' privacy. This particular hack involves using a Facebook application to steal a users personal information - and the information of all their friends - without the user's knowledge.
It's possible for a malicious Facebook application, like the one used in the news story, to masquerade as a game or a quiz. And unlike protecting yourself from phishing emails, it's not simply good enough for you to "know better" yourself - if even one of your friends installs the app, your details get stolen too.
In other words, your security is left to the tech-savviness of you and your friends. (Considering my years in I.T./end user support, that's a frightening concept. Many users aren't smart, savvy, or careful when online.)