I believe the main purpose of tracking based advertising is to know your gender, politics and social class to show you the right kind of car and pet supply. Th

I believe the main purpose of tracking based advertising is to know your gender, politics and social class to show you the right kind of car and pet supply. This discrimination is quite important and before internet people would self discriminate on those basis and buy different magasines, see different movies, walk different streets and advertisers could target their demographics based on that. Now everybody goes to the same social networks so the tracking is used to provide this discrimination A good example is gym membership. There's 20eur/month and 300eur/month ones. The 300eur/month ones really don't want to advertise to everybody, they have a really specific demographic target in mind.