I was working at Capital One a while back, and like most larger companies, they have a referral bonus and an internal recruitment website where you can refer candidates. They also have a personal link so that if you share it with a friend, and they apply, you get credit and the referral bonus automatically. You might know where this is going.

Every month I would post on Hacker News' "Who's Hiring" post with a rundown on a few of the positions we were hiring for, and while I was there I probably picked up referral bonuses for like 10 people.