That depends on how they use it. Targeted ads that profile me as someone who buys things in the niche I buy things are good. someone who has a mouse problem needs your ad for a better mouse trap - they are better off for your product that solves their problem and you are better off for selling it to them.
Targeted ads are abused too often though and so despite the good I have to come out against them. That someone has a mouse problem is sensitive - they probably don't want to admit it even though it is a common problem. If the mouse problem is in a restaurant (which is very common), that getting out will drive customers to competitors (who also have a mouse problem but customers don't know it)
Targeted ads are abused too often though and so despite the good I have to come out against them. That someone has a mouse problem is sensitive - they probably don't want to admit it even though it is a common problem. If the mouse problem is in a restaurant (which is very common), that getting out will drive customers to competitors (who also have a mouse problem but customers don't know it)