Facebook and Instagram have denied their services were hacked today, blaming a 40-minute outage on "a change that affected our configuration systems".
It comes hacker group Lizard Squad claimed responsibility for the outages which left users unable to log into the sites earlier today.
A spokesman for Facebook, which owns Instagram, said: "Earlier today many people had trouble accessing Facebook and Instagram.
"This was not the result of a third party attack but instead occurred after we introduced a change that affected our configuration systems.
"We moved quickly to fix the problem, and both services are back to 100% for everyone."
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