Sid Yadav, a Facebook users in New Zealand, has been using Facebook Questions within his Facebook social circle for the past month or so. His take-away? It could be “the next killer app of Facebook,” he says.He also confirms that it feels different from Quora because it “seems to be more intimate/fun/terse than intellectual/useful/detailed.” Here’s his full run-down in his own words — complete with pictures of what it looks like. Notably, you’ll see that “Questions” has been added to left-column of Facebook, where many of Facebook’s main functions lay. Yes, this is going to be a big product.