FB can show you one ad per month about some special steam train ride and maybe you’ll scroll past it without a second thought but then maybe one day you’ve been watching a film about the golden age of steam or you’ve been talking to a friend about it and then you see the ad and remember the film or conversation and you think ‘Crikey, how on earth did Facebook come up with that as!’
Facebook show (many people) a lot of ads and they only need to get lucky a few times for you to think it’s uncanny. All the non-unique times an ad was not relevant will have blurred together and so you won’t easily remember that they were the vast majority of the ads you see. A little bit of feedback (eg if you dwell on the coincidental ad) may cause you to see more related ads.
Facebook show (many people) a lot of ads and they only need to get lucky a few times for you to think it’s uncanny. All the non-unique times an ad was not relevant will have blurred together and so you won’t easily remember that they were the vast majority of the ads you see. A little bit of feedback (eg if you dwell on the coincidental ad) may cause you to see more related ads.