Facebook flaw enables users to spy
Facebook was forced to take its chat system offline after users found a way to spy on friends' personal information.
The security flaw meant users could view other people's live chats and pending friend requests - processes which are normally meant to be private.
It was flagged up by a technology blogger who said he achieved the feat with "a few mouse clicks".
A spokeswoman for the social networking site said that engineers acted "promptly" to fix the bug on Wednesday afternoon. She said users would have been performing a specific action with their privacy setting to be exposed and that hackers could only see pending friend requests - they could not accept them.
