What I want to know is, were the 10MM pairs all people who make their friendship data public? For people in urban areas, this is sufficiently anonymous. But f

What I want to know is, were the 10MM pairs all people who make their friendship data public? For people in urban areas, this is sufficiently anonymous. But for those faint dots in the middle of nowhere, is it? I think very carefully before I reveal any information publicly about my users. Sometimes seemingly aggregate information isn't.