As an app developer, I don't want to say this is impossible, loading and abusing private libraries has been done in the past. It just seems so unlikely. And it seems like if proved (decrypting network traffic from mobile device?) would destroy Facebook's image w/ customers.

I think more than likely the talking about a certain subject makes the ads stand out more than they would have. It's like, researching to buy a new car, all of a sudden you see that car everywhere on the road. It was there before but you just didn't notice it.

That's my take on it. Again, it's not be impossible. I just think it would be highly likely for facebook of all companies to directly snoop. (Maybe by proxy of other apps?) </TinFoilHat>