Yes, I did ask an employee of Facebook directly. It's hard for them to communicate about in the same way that Google doesn't talk about how it ranks pages. It's

Yes, I did ask an employee of Facebook directly. It's hard for them to communicate about in the same way that Google doesn't talk about how it ranks pages. It's not a trade secrets issue—it's an issue of spam, and I respect their interest in preventing people from exploiting the friend recommendation system.