As tens of thousands of tributes poured in from across the nation for the PC Fiona Bone and PC Nicola Hughes, more than one Facebook page was set up in praise of the suspect held by police.
One was titled Dale Cregan OBE, with internet "trolls" posting messages claiming the suspected killer was a "hero".
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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.