Facebook was inaccessible to some users on Sunday, according to Downdetector, a website that monitors outages.
The site showed there had been more than 7,700 incidents of people reporting issues with Facebook at its peak.
Facebook experienced one of its longest outages in March, when some users had trouble accessing the site for more than 24 hours.
The outage monitoring website also showed that, at the peak on Sunday, there were more than 3,000 incidents of people reporting issues with WhatsApp and 7,000 with Instagram. Downdetector.com’s live outage map showed that the issues were mainly in Europe, Asia and the US.
Facebook did not immediately respond to a request for comment.