Facebook, WhatsApp, and Instagram were the apps that began experiencing connectivity issues at 12:25 PM on Monday, October 4th. The service outage was reported by users worldwide. The services prevented users from making calls and sending and receiving text messages for several hours. When loading Instagram\'s web version, a \"Server Error 5xx\" message appeared, while the app was unable to search for users, upload photos, view stories, check messages, and more. Although the Facebook app was accessible, the impact was less severe than on Instagram and WhatsApp. \"We are aware that some people are having trouble accessing our apps and products. We are working to restore normal service as quickly as possible and apologize for any inconvenience,\" Facebook stated via Twitter. The last situation of this kind occurred on June 9, 2021. However, this Monday\'s outage—which also coincided with another edition of CyberDay—was one of the longest and brought to mind the WhatsApp outage in February 2014, when it stopped working for 12 hours during its acquisition by Facebook. Users turned to social media: Telegram and Twitter. One of the curious metrics from the day was the word \"WhatsApp,\" which was repeated more than half a million times on Twitter. On a more serious note, it is estimated that the service outage resulted in an immediate loss of $6.6 million for Mark Zuckerberg, although the effects on the stock market will likely be seen on October 5.