We're aware that some people are now having trouble accessing the Facebook family of apps.
Facebook did not say what was causing the outages.
Facebook ruled out a cyber attack on its products Whatsapp, Instagram and Messenger, which suffered service outage for hours on Wednesday. "We're working to resolve the issue as soon as possible", its official account wrote.
A third-party outage map suggested the problem was global - DownDetector monitors posts on other social networks for users mentioned a loss of service elsewhere.
Facebook has not commented on the issue. Facebook did not provide an update.
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Facebook users, including brand marketers, expressed their outrage on Twitter with the #facebookdown hashtag.
In a DDoS attack, hackers use computer networks they control to send such a large number of requests for information from websites that servers that host them can no longer handle the traffic and the sites become unreachable.
According to the BBC, this is worst outage in Facebook's history.
In a series of tweets, Facebook confirmed the outage, and said it wasn't being targeted in a DDoS attack, as some people had speculated without evidence. "We're working to resolve the issue as soon as possible". While the sites/apps are working fine for some, others are unable to access or login to Facebook and Instagram.
Many shared jokes about the social media outage leading to the collapse of society, as "nobody remembers how to reach loved ones or eat food without posting updates".