So, I've been using my newly-acquired privilege to see site analytics.
Around about May 20, 2014, there is a precipitous drop in site visits and page views. We went from ~70,000 visits per weekday down ~39,000 visits per weekday. "New visits" and "page views" followed suit.
There is no corresponding dip in posts or votes, so the site was just as active.
Was this a tweak to Google's vaunted algorithm? (That's where the vast majority of traffic comes from. 1) If so, wouldn't there be a similar dip throughout Stack Exchange? Or could it be one (or more) scrapers got taken offline?
1 As of last month, 92% of traffic comes from search engines, and Google accounts for 96% of search engine referrals.