It could very well be, but do you know what kind of evidence you would have to see to conclude that FB is listening? Otherwise you're just making a fully general argument against the possibility of this (or any such scheme) happening.
Side anecdote: One weekday after I vacationed in Tahoe, I saw a BART (subway) ad for Tahoe, and I was like, "oh, great , probably because I just came back from ... wait, that's not possible!"
Side anecdote: One weekday after I vacationed in Tahoe, I saw a BART (subway) ad for Tahoe, and I was like, "oh, great , probably because I just came back from ... wait, that's not possible!"