First a Siri joke, now a 9/11 conspiracy? Facebook Trending is having a really bad week

Facebook's Trending Topics feature is in trouble. Again. 

The section, whose human editors were recently replaced by algorithms, has promoted a "truther" article from a British tabloid claiming the Twin Towers in New York collapsed on Sept. 11 due to a "controlled demolition."

On Friday morning, users hovering over the "September 11th" trending topic ahead of the 15th anniversary of the attack could see an article from The Daily Star entitled "September 11: The footage that 'proves bombs were planted in Twin Towers'."