Facebook could has something better than Google intent in that they should be able to predict what you intend to search for before you go looking for it.
You could say that Google responds to your demand while Facebook (at least in potential) creates new demands.
If we're still going with the given example, Facebook didn't create anything except a forum where a mom posted a status update.
There's no reason for an advertiser to pay to serve an ad for that. The ad was just given away for free. Unless you want to watch the show right at that moment, you wouldn't click it anyway.
So, I'm missing the part where Facebook can monetize the "new demands."
I was going with the example of Facebook using their knowledge my tastes, as well as the tastes of millions of people who are somewhat like me, to introduce me to things that I would have a legitimate interest in, even if I'm not searching for them.
Example: Subject is a coffee-drinking, Vespa-riding, snappy-dressing, backyard chicken-farming, photo-snapping, game-playing father of two small children. He's not looking for bluetooth cuff links, but we know that once he sees them, he'll be likely to buy because that's what other people in his micro-niche tend to buy.
You could say that Google responds to your demand while Facebook (at least in potential) creates new demands.