Mashable: "Facebook shadow profiles. You may have seen the term crop up on tech news sites this week, and it may given you the feeling it's a nefarious privacy violation — or the first fun feature that Facebook has introduced in years.
But, seriously: Are shadow profiles real? Do I have one? Are they bad?
If you use Facebook, then the answer to all three of those questions is "yes." Let's take a trip into the shadowy recesses to learn more."