You don't notice all the times you talk about something and you don't see relevant advertisements. After talking about it you're primed to notice it more. Addit

You don't notice all the times you talk about something and you don't see relevant advertisements. After talking about it you're primed to notice it more. Additionally this isn't isolated - you could be talking about it indirectly due to advertisments being out there (e.g. someone else sees an ad, posts / talks / youtubes about it, you talk about it and then see the ad). Ads are getting more targeted and getting closer to the kind of things you would talk about based on your interests and data that networks have collected about you, but we are still pretty far from continuous ad surveillance.