Didn't Zuck say recently that the actual numbers weren't concerning, and that they're aware they are past the "cool" stage and instead want to move on to become the social fabric of the Internet, much like a utility.
I don't really see this as a problem. The people who you wouldn't loose contact with are the ones worth focusing on, because it means you actually care about them.
Whereas If I'm understanding you correctly, you would say that he is offering utility only if the birds are at his feeder because of some unique bird-attracting design features of his feeder which the other feeders lack.
That seems to me to be confusing an implementation detail with what actually matters to the user: he just wants access to birds (his friends). He doesn't care why they are where they are.