After Facebook's struggle with one privacy issue after another this year, some in the industry are raising privacy questions about Facebook's new messaging system .

On Monday, the social network unveiled Facebook Messages, a system designed to handle the convergence of different kinds of messages - e-mail, instant messaging, SMS and Facebook messages -- and bring them together under one social umbrella. Users will be able to have their own facebook.com e-mail address, but the system also will work with other e-mail systems, including Google's Gmail and Yahoo mail.

As Facebook CEO Mark Zuckerberg explained the new system at a press conference in San Francisco on Monday, never touched on how the company plans on keeping users' messages private and secure.

More: http://www.pcworld.com/article/210873/