Facebook and its Instagram and WhatsApp platforms were down across wide swathes of the world on Monday.

The company said it was aware that "some people are having trouble accessing (the) Facebook app" and that it was working on restoring access.

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The company did not say what might be causing the outage, which began around 11:45 ET.

Facebook is going through a major crisis after the whistleblower who was the source of The Wall Street Journal’s series of stories exposing the company’s awareness of internal research into the negative effects of its products went public on “60 Minutes” Sunday.

LOOK: Here are the pets banned in each state

Because the regulation of exotic animals is left to states, some organizations, including The Humane Society of the United States, advocate for federal, standardized legislation that would ban owning large cats, bears, primates, and large poisonous snakes as pets.

Read on to see which pets are banned in your home state, as well as across the nation.

25 True Crime Locations: What Do They Look Like Today?

Below, find out where 25 of the most infamous crimes in history took place — and what the locations are used for today. (If they've been left standing.)

50 Most Popular Chain Restaurants in America

YouGov investigated the most popular dining brands in the country, and Stacker compiled the list to give readers context on the findings. Read on to look through America's vast and divergent variety of restaurants—maybe you'll even find a favorite or two.