[cwilkes]

Well it doesn't matter if you use FB or not.

I bet the patients of the Doctor found themselves through each having her phone number. Hey they both are "friends" with this person maybe they should be friends as well.

This doesn't require for the middle man to have an account. You are inadvertently acting as a conduit for people to connect to one another.

FB likely has a "ghost" account for you anyway that they use to do this connection. So it is like you are using FB in some alternate universe.