A media frenzy was born on Feb. 27, when the hashtag #WhereIsKate exploded online with speculation about the whereabouts of Britain’s Princess of Wales. It opened a rabbit hole of amateur detective work, memes, bizarre theories and jokes — mixed with genuine concern about Kate’s health — into which thousands of people descended until her announcement last week that she was recovering from cancer. The episode offered the royal family — and everyone else — a lesson in the modern world of online media: If your silence leaves an information vacuum, others will rush to fill it. And the results may be messy. Read more at the link in our bio. #APPhoto by David Cliff.