My wife has this happen to her frequently. I bought a friend a bottle of Woodford Reserve (Bourbon) for his birthday and it appeared within a few days for her after discussing it on the way to the party (she doesn't even drink). Additionally, we have talked about "blue Gatorade" in the car only to have Cool Blue Gatorade show up within a few days. The one that really freaked me out was the "Thunderstorm" color paint that we saw a commercial for and briefly discussed. None of these things were actively searched on her device and were only talked about in private. I would believe some of the explanations here but the wide spread of items makes me think that Facebook and Instagram are passively listening to our conversations. These three items all appeared within the same month and within 72 hours of talking about them in person. I don't believe it could be a coincendence at this point.