How Much Do Advertisers Really Know From Your Browsing Habits
Targeted ads can feel unsettlingly accurate. Here's a realistic look at what advertisers actually know and infer.
Advertisers typically don't know your identity in the way a friend does, but they build a detailed behavioral profile from browsing patterns, purchase history, and app usage that can predict interests and habits surprisingly accurately.
How the profile actually gets built
Tracking technologies follow browsing activity across many unrelated websites, and that combined pattern, which sites you visit, how long you stay, and what you search for, gets fed into models that group you with similar users and predict likely interests.
Why ads sometimes feel eerily specific
What often feels like an advertiser reading your mind is usually a combination of recent searches, a purchase from a related site, and broad demographic inference, coincidentally aligning closely enough to feel personally targeted even without any single dramatic privacy breach.