A site I frequent, Lockpicking101.com, recently had a small competition, wherein one member challenged the rest to find out his first name, for prizes based on the time it took. He doesn’t use his firstname, and goes by his second name at all times, even on legal stuff.
So a lot of people started trawlling through the 1500+ posts he had made on the board, and the like. However, the challenge post included his place of work. But you could hardly just call him up and ask him his first name, though, could you? The challenge was only 2 hours old, and he’d never fall for that.
You could. Listen to this.