how does facebook know what ads to show on your profile?

[Kim T]

[sr_engr]

It sells all your information to folks with high power analytics tools. Very fancy computers and math. They track you over a multitude of sites, and watch for things like age, gender, interests, shopping habits, political affiliations.

They can use those to crank out which product you are more likely to buy.

[debijs]

~~You put in your name, address, and zip. There system allows them to to put advertisers through to your area for directing marketing advertisements.

Also some of the applications you request access all your personal information. They are the ones who sell lists for direct advertising as well.~~

[Abhimanyu]

They are highly targeted ads..!!
when you create ads they ask many thing
such as
Place, Country.
even you can restrict ads to show only boys or only girls