[objclxt]

> It's hard to imagine a less sinister explanation for this phenomena.

You just forget all the other signal you've giving. Funnily enough, last week somebody was trying to convince me that Facebook was recording their every word.

"I was telling a friend about a recent trip to Thailand", they said, "and I immediately saw an ad for Thai Tea". I asked if he'd used Facebook when he was in Thailand. He had.

Which is more likely: Facebook is recording every conversation of every user on their app and mini them for ads or the advertiser in question just targeted people who had recently been to Thailand.