I reviewed this question just now, accepting a suggested edit. I noticed that the user had no reputation (just the 100 bonus), and yet, had a gold badge.
I thought, as I have seen many times, that this might be an example of some old yet inactive users who asked a single question which had so many views it awarded them the "Famous Question" gold badge. As usual, I am curious about which question would that be. So I went to the user's profile, and found, to my surprise, that the badge was because of the "Fanatic Badge".
"That's weird" I thought. Why would someone visit a site so often, and yet, never given an answer or ask a question, or write comments, or any other activity?
Then I went to the user's network profile, and found that he has the "Fanatic Badge" in around 150 accounts, almost all of them without a single answer or question, just the association bonus! Have you ever seen such a keen user, with so widespread interest (in visiting but not participating) like Biology, Robotics, Law, Travel, ..., and languages like Korean, Esperanto, Latin, Japanese, Italian, Ukranian, French, Spanish, Chinese, Portuguese, German, and Russian?
So I conclude, this user is clearly gaming the system, perhaps using some type of automatic tool/script to visit a series of sites consistently.
Do you think this is the case? Is this "legal"?