Facebook, Instagram, and WhatsApp confronted a gigantic blackout recently that brought down all services presented by the organization for more than six hours. Albeit each of the organization’s social networks are back online, that didn’t prevent Facebook CEO Mark Zuckerberg from losing more than $6 billion surprisingly fast because of the present blackout.

As revealed by Bloomberg, Facebook stocks were down almost 5% on Monday, and 15% down contrasted with mid-September. As expected, these numbers likewise influenced Zuckerberg’s worth, which finished the day at $121.6 billion. Zuckerberg has slipped to fifth spot in the Bloomberg Billionaires Index, a ranking of the 500 richest individuals in the world. In fourth spot is presently Microsoft cofounder Bill Gates with $124 billion net worth.

Clients started experiencing issues with Facebook’s services (which incorporates WhatsApp and Instagram) around 8:40 a.m. PT. It wasn’t well before each of the organization’s social networks went totally offline around the world. A few clients went to Twitter and other social networks to complain about the blackout, which lasted more than six hours.

While the specific reasons that caused the blackout remain unclear, it appears to be that Facebook was influenced by a DNS issue that “wiped” the ways to Facebook domains. Indeed, even the organization’s internal network was influenced, which made the blackout much more and more complicated.

By 6 p.m. ET, both Facebook, Instagram, and WhatsApp were back online.