Have you ever paid attention to the kind of ads that appear on your social media accounts and how they seem to be streamlined towards things that actually concern you and your immediate surrounding?
Sometimes it looks like someone is actually monitoring your activities and feeding your information to the advertisers who find a way of focusing on your interests. A sports lover seems to find ads relevant to not just sports, but his favourite sporting activity. Same with someone who is into fashion, most of the ads he sees will revolve around clothing and designs.
https://volum.io/2019/06/10/understanding-proximity-marketing/