Facebook, Instagram and WhatsApp went offline for users across the globe, the social media giant said on Monday, as it worked on restoring the services after being hit by one of its longest outages.

The disruption, which hit Facebook’s platforms minutes before noon, comes a day after a whistleblower accused the firm of repeatedly prioritizing profit over clamping down on hate speech and misinformation.

Shares of Facebook, which has nearly 2 billion daily active users, opened lower after the weekend’s whistleblower report and slipped further to trade down 5.3% in afternoon trading on Monday. They were on track for their worst day in nearly a year, amid a broader selloff in technology stocks on Monday.

Facebook was inaccessible because users were not being directed to the correct place by the Domain Name System. Facebook itself controls the relevant settings.

DNS allows web addresses to take users to their destinations. A similar outage at cloud company Akamai Technologies Inc took down multiple websites in July.

Security experts tracking the situation said the outage likely was triggered by a configuration error that left directions to Facebook servers unavailable.

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