Doubtful.<p>Facebook has mechanisms for defining both familial and romantic relationships, as well as usage data in the form of profile visits and wall comments and likes.<p>It might be a little more work, but I'm sure they can take a large friend list and still figure out who's family, who's a close mutual friend, who's disproportionately interested in who, and who's a fake friend just there for the purposes of social gaming.<p>Even better, since this true social graph depends largely on usage data, it's available to Facebook but not to scrapers.