Users around the world have once again had difficulty accessing Facebook's services for hours due to changes in the system.
The first photo-sharing app, Instagram, was affected in the middle of the night on October 9, shortly after users complained about access to Facebook and Messenger.
"We sincerely apologize to anyone who has not been able to access our product in the last few hours," a Facebook spokesman was quoted as saying by AFP.
"We have fixed the issue and now everything should return to normal," he added.
The website Trouble Tracker Down Detector also saw an increase in reports of problems accessing or using the Facebook and Instagram networks, as well as Messenger and WhatsApp.
Facebook attributed the problem to a configuration change on its computing platform and said it affected users of social networks and Instagram, Messenger and workplace globally.
A large number of people took to Twitter to express their concerns.
In a tweet, a cartoon can be seen sitting in a corner as a punishment, with the comment, "What happened to Instagram?" Not even 4 days and it went down again.
For more than six hours on Monday, millions of people were unable to access Facebook, Instagram or WhatsApp, which highlighted the world's reliance on the Silicon Valley-owned company-owned platform.
In an apologetic blog post, Santosh Jaredhan, Facebook's vice president for infrastructure, said the shutdown was due to configuration changes in routers that support network traffic between data centers.
Cyber experts believe that the problem is known as the BGP or Border Gateway Protocol, a system that uses the Internet to pick the fastest way to get information.
It is unknown at this time what he will do after leaving the post.
According to Facebook, Friday's shutdown is not related to Monday's issues.
Experts say Facebook's technical infrastructure is extraordinarily dependent on its system.
According to the website's tool tester, the closure of social media is not uncommon, with Instagram alone experiencing it more than 80 times in the United States last year.
Facebook services are important to many businesses around the world, and Facebook accounts are also commonly used to log in to other websites.
Facebook apps are used by billions of people every month, meaning that their closure could affect a large part of the world's population.
