I got the ad on instagram.

I agree that it could be posted somewhere locally in the real world, and it may have been, but the interesting part is that I dont live in my hometown anymore, even though I travel there frequently. I live in another country, 4 hours away, so I would have never seen a real world ad. Only instagram and all the data they connected about me knew my ties to my hometown and my interest in the music hence they showed the ad.

I agree on all the stalking points and I dont like that they have all this data, but this one time it was useful, i can not deny that.