Double Olympic gold medallist Mo Farah said it felt "weird" to return to his old school today for the first time since he left.
The middle-distance runner visited Feltham Community College to pass on his words of wisdom to students.
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The outage struck Hartfield-Jackson Atlanta International Airport at around 1pm local time, stopping all outgoing flights.
It will be a chilly day for many parts with the highest temperatures, about 10 Celsius (50F) in the far northwest.
The social site has been overhauling many of its policies in recent weeks following repeated criticism over how it handles abusive content.