Facebook seems to be taking out a few features from both its purchased business and main application. The social network site will be taking out the option for users to opt out of being searched by others on the website. The removal of the “Who can look up your Timeline by name?” has been taken out for those who wanted to a few months ago. Now, all users can't hide themselves for Timeline search. If you want to avoid being searched by others, you are going to have to block them individually.
Source: CNET Australia