Three social networking giants are experiencing worldwide issues Monday.

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Facebook, Instagram and Whatsapp each announced on their Twitter accounts that their apps and websites are down. The reason for the crash is unknown, and it is unclear when the issues will be resolved.

Instagram and Whatsapp are both owned by Facebook, and it seems as though the blackouts occurred at the same time Monday. Facebook Messenger is also included in this error.

Facebook is the world's largest social media company, gaining the title after acquiring Instagram in 2012 and Whatsapp in 2014.

For updates on when the social media sites will be back up and running, follow their Twitter accounts here: Facebook | Instagram | Whatsapp.

Also, visit the web traffic monitor downdetector.com for updates on the sites in real-time.

RANKED: Here are the most popular national parks

To determine the most popular national parks in the United States, Stacker compiled data from the National Park Service on the number of recreational visits each site had in 2020. Keep reading to discover the 50 most popular national parks in the United States, in reverse order from #50 to #1. And be sure to check with individuals parks before you visit to find out about ongoing, pandemic-related safety precautions at www.nps.gov/coronavirus.

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Inside Amazon: A Detailed History of America's Biggest Online Retailer

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Every beach town has its share of pluses and minuses, which got us thinking about what makes a beach town the best one to live in. To find out, Stacker consulted data from WalletHub, released June 17, 2020, that compares U.S. beach towns. Ratings are based on six categories: affordability, weather, safety, economy, education and health, and quality of life. The cities ranged in population from 10,000 to 150,000, but they had to have at least one local beach listed on TripAdvisor. Read the full methodology here. From those rankings, we selected the top 50. Readers who live in California and Florida will be unsurprised to learn that many of towns featured here are in one of those two states.

Keep reading to see if your favorite beach town made the cut.