obviously having referrals to companies really helps getting a foot in the door, or at least helps get you initial calls and interviews. Do you think it matters or helps at all to have multiple referrals to a company instead of just one? (outside of someone directly knowing a hiring manager)
Not at Amazon. Only first referral matters.
The strength of the referral matters. If you really worked with referral is better than if you just know them.
No, try to get it from the most senior person or whoever you think has the most pull
Not in my experience.