"Earlier today, people may have experienced trouble accessing Facebook's family of apps. The issue has since been resolved, we are back to 100 percent for everyone and we're sorry for any inconvenience," a company spokesman said in a statement.
Facebook blamed "an issue in one of our central software systems" for snarling connectivity for several hours.
Many users, often wryly, took to Twitter to comment on the crash.
Downdetector, which monitors outages on the internet, said users of all Facebook platforms started having trouble at 1345 GMT.
As is often the case with these outages, this one seemed to hit randomly around the world, with some regions affected and others not.
Facebook says it has 2.45 billion active monthly users across its array of products.
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