If I may interject, I think in most cases it's much, much better to use a network of connections rather than random walk-ins. You're much more likely to get someone that not only performs well, but also fits in well with your company's personalities.
It is possible that this person is being interviewed by Google as a result of a referral by another employee within the Google, or even a referral from the hiring manager themselves.
Unless what you mean is that a hiring manager only consider people whom he and every other potential interviewer already know before the interview process even begins. The odds of ending up with such an arrangement at a place the size of Google, or even a place 1/100th the size of Google, seem insanely remote.
Someone on an interview loop at a large organization is bound to not know you from every other candidate who walks in the door. Even with phone interviews, odds are they call people based on factors entirely other than "do they know this person?" The best he may know about you is that some other person in the organization referred you, but it is not obvious whether they'll appreciate knowing this or be pissed off that their objectivity is now screwed. Some interviewers really prize trying to be as objective as possible in interviews, because interviews have a habit of being horribly imprecise anyway. But then, so do referral from J. Random Employee ("I have this cousin who's really good with computers; he helped me setup Outlook and everything. We should hire him a as software engineer.")
But then, maybe that is your point. If a company ends up at a size where they can't rely on connections, they're too big already.
It is possible that this person is being interviewed by Google as a result of a referral by another employee within the Google, or even a referral from the hiring manager themselves.
Unless what you mean is that a hiring manager only consider people whom he and every other potential interviewer already know before the interview process even begins. The odds of ending up with such an arrangement at a place the size of Google, or even a place 1/100th the size of Google, seem insanely remote.
Someone on an interview loop at a large organization is bound to not know you from every other candidate who walks in the door. Even with phone interviews, odds are they call people based on factors entirely other than "do they know this person?" The best he may know about you is that some other person in the organization referred you, but it is not obvious whether they'll appreciate knowing this or be pissed off that their objectivity is now screwed. Some interviewers really prize trying to be as objective as possible in interviews, because interviews have a habit of being horribly imprecise anyway. But then, so do referral from J. Random Employee ("I have this cousin who's really good with computers; he helped me setup Outlook and everything. We should hire him a as software engineer.")
But then, maybe that is your point. If a company ends up at a size where they can't rely on connections, they're too big already.