Facebook said on Wednesday it has found a bug that made some instant message conversation visible to a user's entire list of friends. The site shut down its chat service to fix the problem.
The problem emerged from what was intended to be an enhanced privacy feature. The new tool allows users to preview how their profile appears to other users.
On Wednesday, many users began complaining that they could see live chats of the Facebook friend they were setting their profile for, as well as pending friend requests.