According to Bloomberg, Facebook's stock fell 4.9 percent due to the service shutdown, which cost the company's founder Mark Zuckerberg 7 billion.
Facebook did not say who changed the configuration or layout, nor did it say if it was pre-arranged.
Some Facebook employees, speaking on condition of anonymity, told Reuters that the shutdown was due to an internal error in getting Internet traffic to the system.
In addition, employees said, the failure of internal communication devices and other network-related malfunctions exacerbated the problem.
Security experts said that it is possible that someone working in the company may have made an unintentional mistake.
"We want to make it clear that we believe the main reason for this closure is the wrong configuration," the Facebook administration said in a statement.
Facebook's service suspension is the longest shutdown of its kind to date, tracked by web monitoring group Down Detector.
The shutdown is the second major loss to Facebook in a few days.
Earlier on Sunday, a data scientist accused Facebook of preferring to make a profit instead of dealing with hateful content and misinformation.
When Facebook's service was suspended, users around the world turned to rival apps, such as Twitter and TickTalk, which caused Facebook shares to fall.
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