I know it sounds easy to get this badge. After all who doesn't have a Facebook account?
Wrong, 300 unique IP addresses in 4 days is not easy to get, because
a. You don't have that many friends
b. They most probably aren't programmers
c. In 4 days the link will be way behind The Great Wall of le rage comics and nobody will see it
300 IP adresses = 300 people = more pageviews than most questions ever have (esp. in 4 days).
Oh, and 37 (silver) Booster badges were awarded, while there's 14,751 (golden) Famous Question badges out there. Misbalance?