Online social networks, such as the well-known Facebook, allow users to form connections with each other quickly and easily. A user might invite another to become their “friend,” “like” a page they have created on the system, or join a group that forms a community within the overarching community. Of course, it is implicit that one should only “friend” people one knows. But, there are millions if not billions of connections where a user may not be even a passing acquaintance in the offline world and yet well connected to another person in the online.