DownDetector, a platform which tracks website issues, recorded a huge spike in problems. "We're working to get things back to normal as quickly as possible," Facebook told Newsweek.
The platform, which runs on blockchain technology, is expected to launch for consumers in 2020 and is backed by a group of companies, including Mastercard, Visa and PayPal.
The U.S. social media company told Newsweek that it is "taking steps to ensure compliance" with a trade ban placed on the Chinese technology company last month.
Pegasus malware, typically sold to intelligence agencies, can spy on calls and texts while also recording audio and video from phones.
"Every day that we go on without getting to the bottom of this matter is a day that we are putting hundreds, if not potentially thousands, of Americans at risk," the progressive Democrat from New York warned.
"What's he trying to keep secret?" asked Democratic Representative David Cicilline of Rhode Island.
Jared Kushner's alleged use of WhatsApp for official communication with foreign leaders was dangerous, cybersecurity expert Clint Watts said.
Digital communication presents uncomfortable social situations that can lead to anxiety, isolation and feelings of rejection.
One group active this week was titled "Kids boy gay" and contained more than 250 members, according to the Financial Times.
Last week, WhatsApp rolled out its new "Sticker" feature for Android and Apple iOS.
The accused face up to 15 years in prison for violating child protection laws.
WhatsApp co-founders Brian Acton and Jan Koum have both left Facebook, which acquired the company in 2014 for $22 billion.
Government officials want greater access to secure communications data.
WhatsApp dismissed the report, claiming they were aware of the issue.
The game is being compared to the "Blue Whale Challenge" of 2015, which was allegedly linked to hundreds of deaths.
Groups of up to four can share fully encrypted video chats.
WhatsApp will remove a "quick forward" button next to media messages for Indian users.
More than one dozen beatings have occurred across India this year due to fake messages about child abductors.
The "text bomb" stores thousands of hidden characters that will overwhelm the app or smartphone in seconds.
Speculation has mounted that Koum clashed with Facebook over how it used personal data collected from WhatsApp.
Police in South Wales made 11 convictions after tracing fingerprints from a single photo.
Brian Acton's statement came in the wake of the Cambridge Analytica data scandal.
The feature currently lets mistaken chats be recalled within the first seven minutes.
Moxie Marlinspike and Brian Acton announce the creation of the Signal Foundation, a new non-profit, to develop secure communications.