I was dating this guy and we would spend all day text messaging each other. And he thought that he could tell that he liked me more because he actually spelt the word 'YOU' and I just put the letter 'U'.
We are a consumer company and our success is directly linked to our users trusting us. Therefore we have the same incentive as the user: they want to see relevant advertising so their experience of Google is positive and we want to deliver it.