...And now, with Facebook’s newfangled search tool, it can allow strangers, along with “friends” on Facebook, to discover who you are, what you like and where you go. Facebook insists it is up to you to decide how much you want others to see. And that is true, to some extent. But you cannot entirely opt out of Facebook searches. Facebook, however, does let you fine-tune who can see your “likes” and pictures, and, to a lesser extent, how much of yourself to expose to marketers.