Hopefully because Hackernews was becoming NSANews.com. That shit was obnoxious. When 20 of the top 25 posts are about one topic you might as well open a new tab and do a search for that topic.
I don't mind the NSA articles, since I can just skip them depending on my mood, but I was a bit miffed that the iPhone 5S thread was all about "zomg fingerprints!" Nobody wanted to talk about 64-bit A7, the uses of the fingerprint sensor, etc.
Please don't post on HN to ask or tell us something (e.g. to ask us questions about Y Combinator, or to ask or complain about moderation). If you want to say something to us, please send it to info@ycombinator.com.
I did notice a sudden lack of NSA stories, I just thought the community came to its senses. Glad to know there's someone who cares about the quality of the site. I, for one, applaud the move.