Or consider another scenario: your friend went to said restaurant and paid for something; read an article about the restaurant; viewed/interacted with an ad for the restaurant; liked a social media post for the restaurant; or was geo-tagged at or around the restaurant. Any of the above would be sufficient to associate your friend and the restaurant, and I'd wager targeting your social graph after you've interacted with a product/service would have a good ROI.

Alright here's another anecdotal experience. To preface it, i don't have Fb app or messenger on my phone but have WhatsApp and Instagram. I opted out of whatsapp's data sharing policy when you were able to do it.

So i was walking with co-workers for coffee and somehow we talked about a college. Now i can assure you that i have never ever searched for that college and i didn't even know it existed before that conversation took place. And 30 mins later, i'm browsing instagram at work and there is an ad of the said college. If this isn't creepy af, i dunno what is.

It might be creepy, but it might not be. It is possible that the conversation influenced the ad shown. But it is also likely that ad would have been shown no matter what the prior conversation was about. If the conversation hadn't included talking about the college prior to seeing the ad it would have been a non-event. But being primed in advance makes it at least feel like a freaky coincidence or at worst nefariously creepy targeted advertising.

These kind of events happen by chance and have been happening well before almost everyone started carrying mobile recording devices in their pockets and even pre-internet.

I have no doubt that advertisers would love to have that kind of insight but I can't help but feel that the anecdote of the form, we talked about A and A showed up X minutes later, is too easily explain by coincidence. How many topics were discussed, how many ads were shown? When I read something like this I imagine the anecdote should read more along the lines of how we talked about A, B, C, D, E and F and among the dozen or so ads I saw afterwords one of them was topic A! Can you believe it? And yes, yes I can, that is a pretty neat coincidence.

On the other hand if out of all 6 of the topics discussed all of the ads that were shown afterward were related to them, maybe not all, but more than one or two. That sounds like there is something fishy going on.

I don't mean to single out this particular example, it was to be a simple comment that had more to say. So, thank you for the inspiration!

The first time it happened to me, I considered it a coincidence. And the next few times too. It must because the game is new, or they know I've been searching for new floors on my computer, ect. But it keeps happening, and it's always in the time following after it was talked about, but not searched for. It has happened for things we talked about at friends place, that is completely outside what my wife and I would do.

The most blatant I've experienced was on the Wii U. The controller with the screen powers up and shows ads for new games every now and then. We actually had a bit of fun with it, casually talking about new games and guess what happened. An ad for that particular game was shown. I'm 100% certain now, that it happens with smartphones as well.

When I was a child and had history class, I was always surprised to see there was documentary about the period I was currently studying on the TV.

I thought that was some great scheme made by the adults.

Turns out, it isn't. Just everyday life coincidences. Reinforced by the global rythm of social life.

College ads are more likely to appear in the periods when people talk about college.

It could be the ads came up a more conventional way - the makers are priming the publicity for the game so it shows up in magazines and ad buys etc. If you and your friends are avid gamers - you probably get some early exposure before more general ad channels buys show up.

But to really answer this question, we could build a better experiment. Write out a set of topics on index cards. You have to be careful that topics aren't new product rollouts (otherwise you really have to think about how you decided to write that topic down in the first place). Draw a card, don't talk about or search the topic for some amount of time, then inject the topic where it might be observed (talk about it and/or search for it somewhere), then for some amount of time, see if it comes up.

Also keep track of every time that you see references to each topic both before and after bringing them up.

And have a control group that you simply don't bring up at all. Make sure to have more than one, so that you still have more remaining if someone around you brings up one of your control topics.

You're surprised that the Wii U is able to show you advertisements for games?

It shows advertisements for games I talk about. Games I do not search for.

Here's a fun experiment idea. When you are around friends and the Wii U, only talk about games that came out at Wii U launch, ideally one you don't have. Like, FIFA Soccer 13 or something. Don't ever search for that game or talk about it away from the Wii U. After a week or so of that, see if you get an ad for it.

"We were talking about new games and I got and ad for a new game!" sounds like pretty standard, non-targeted advertising. Easily chalked up to coincidence. Steam advertises new games to me, some I'm interested in and some I'm not, but I don't think Steam is reading my brainwaves.

How often does it show advertisements?

How many Wii U games are there anyway?

Would you expect the Wii U to do some sort of correlation (other people that own the same games A & B also own C, so you're probably interested in C)?

I cannot remember that it have ever showed one while I was sitting and reading an entire evening. But as soon as we start talking it will show advertising. That could be explained that it simply detects noise in the room, but it correlating to what we're talking about more often than not.

There's an option to disable it waking up and displaying things, so I've never seen adverts on mine (but maybe there's other things shown you do want to see?)

College is running an ad campaign, one of your co-workers saw it (consciously or unconsciously) earlier in the day, and that is what lead to the college coming up in conversation?

Nah, we were talking about universities (i'm in Canada and almost every uni has an associated college) and topic shifted from that uni to college.

Also, let's say what you are saying is true. How come ad decides to show up 30mins - 60 mins after conversation takes place?

Your friend could have searched for the college before or after your discussion, or maybe even your friend had just been looking up old college friends on Facebook lately and that was enough to match up that ad and you. Not that I wouldn't put it past Facebook to do something like this, but it will be hard to prove from anecdotes because, ironically, Facebook captures so much other data that plausibly could reveal the same connections.

What about the hundreds or thousands of other ads you see each day which have little relevance? It's easy to remember the ad that is creepily accurate, but I don't think it's at all surprising that these ads are occasionally hitting the jackpot

Alternate explanations:

* the "somehow we talked about a college" is because someone else at coffee was looking at something college related and it was recently on their mind so they brought it up. You're associated with those people, so ad agency it decides to show you an ad. It may do this a lot, but the times it actually works really stick out to you.

* After the coffee, one or more people search or perform actions associated with that college. Ad agency knows you were recently meeting with them so decides to show you some associated ad.

Keep in mind that the ad agencies, whether Facebook or Google or some lesser known but still large one, have their own profiles of you and who you associate with.

I think Occam's razor holds that since we know there are multiple agencies tracking what you do and who you do it with online and that can conceivably be used to explain most of this, it's a much more likely explanation than a large company outright lying in a way that would have a horrendous backlash if proven (and it's not really that hard to prove if people got serious).

Edit: whoops, not that hard to prove...

I get ads all the time that appear to be directly related to what my boyfriend, a non-facebook user, has been searching for. I figured it must be some IP based analytics.

Was your friend talking about the college because he saw an ad on Instagram or Facebook for it? Often times my roommate and I are in the same ad cohorts on Instagram and will see the same advert within a few days to each other.

And more importantly, that would be much more accurate AND lower risk than the conspiracy theory trying to transcribe everything the microphone hears when it's buried away in your pocket or bag and target ads based on that.

You don't need to transmit the audio. Just transcribe to text, remove any common or stop-words (a, an, the) and transmit what's left over in encrypted form to cover their tracks.

I wonder whether there is another mechanism at play. Often when I have conversations with friends, it's likely that either I or they search a term, or have done so recently. Couple that with the social graph and location tracking, and it's very easy for Facebook/Google to target an ad knowing when I interacted with another person and assume that I may have interest in the term that was recently searched by them.

A creepier one is before I proposed to my fiance I would now and then look up rings. One time I literally said "I need to look up some rings again" and went on Instagram not short after and BAM! There it was an advertisement for rings. It's too damn creepy of a coincidence, and I rarely ever believe in coincidences (sure enough more times than not they're not - at least in my experiences). There's been other moments of things I hadn't looked up or bought that I mentioned verbally and damn it, sure enough an ad on Instagram. It's downright witchcraft. Maybe I'll start documenting the phenomena every time it happens, maybe they'll auto take me out of the A/B testing for this by scraping HN. Ok I needa take off my tinfoil hat... Then again, could Google (Android is on my Phone) sell more detailed data to Facebook? I am going to heavily consider finally rooting my phone and installing a ROM on it.

I can't tell if you are being sarcastic or not.....

Wedding rings have an EXTREMELY high margin, and almost infinite budget for advertising. If you google rings once, you will continue seeings ads for YEARS, regardless of any conversations you have.

Honestly if Facebook knows you are in a relationship for 3+ years and you are under 35, you are going to start seeing ads for engagement rings even without searching for anything.

If you really think they are getting you through the microphone, start talking to your phone without anyone around, while browsing Facebook about Baby Diapers, Baby Formula, and Baby Toys. Don't search for anything baby related, and obviously use something else if you are a Father already.

I'm mostly being a bit over dramatic about it, but I did suspect my mic being snooped on when it did happen, could you blame me / anyone? Hence this article was written. It's very reasonably a coincidence considering how often I would search for rings, but creepy nonetheless. Hadn't seen those ads prior to starting on my search though.

My favorite is when you finally buy something and they still show you ads. Like a coworker mentioned, if I buy a refrigerator I don't need another one... I have one house! Come on! Maybe they do it in case you change your mind? Who knows how these ad companies think.

They keep showing you ads for the fridge because they don't know you have purchased the fridge.

The only way for them to know you have purchased a product is if you buy it online and get hit with the confirmation tracking pixel on the checkout page.

Most people see ads for a fridge, but then go into a physical store to make and finance the large purchase.

Oh no, that doesn't matter. I can search for something a buy it online, and be pestered with ads for the same product for days.

The ad-placement folks have technology and patents and millions tied up in all that. And what do they come up with? "Show ads for what they just bought"

Its more complicated than that. You are probably included in separate funnels that can't communicate.

The "fridge store" is doing a pixel based retargeting list, which is easy to take you off when the purchase is made.

But they also might have a list of 'customers likely to purchase a fridge' from Google searches that you are being served ads to as well. You might be on a 'look-a-like' list from Facebook, because people in your demographic tend to buy new fridges. You could be removed from that list if Google shared the IP addresses of everyone on their list, but at a serious cost to your privacy. These walled gardens are ultimately good, but result in a ton of advertising inefficacy.

I know its annoying but the advertisers are smart enough... we don't actually want them getting any better than they are now.

I don't buy it at all. I buy a fridge; the next time I'm on a browser, its fridge ads all the way. No way it isn't 1:1.

I agree with this. I don't think these companies need to tap your phone to figure out how to choose an Ad for you. They can do an excellent job just knowing that someone is at your house looking up something specific. I suppose one could argue that your privacy is really only worth as much as the person standing next to you values theirs. People just need to understand that their personal privacy decisions really aren't so personal after all.