Answer by Frederic Haddad:
See what Google knows about you or your computer.
Go toon your browser and it will open the advertisement profile that Google created for your browser on your computer, which is linked to you if you use that computer and browser.
On the "Google Ads Across the Web" panel, you can see which gender Google guesses you are, which age it thinks you are, which languages it thinks you speak, and more importantly, what you are interested in!
So click the "Edit" button near your interest and see what Google knows about your interests 🙂 You'll be surprised at how much more Google knows about you and your interests, and now you know how the ads you see online are chosen to match your interests.
Now go to your friends' computers and open that link with them and have fun!