The more than 50 million profiles represented around a third of active North American Facebook users, and nearly a quarter of potential US voters, at the time, the paper said.
The findings indicate advances in technology and social structures unexpected so early in our species' history, scientists said.
American soldiers killed 504 people on March 16, 1968, in Son My, a collection of hamlets between the central Vietnamese coast and a ridge of misty mountains, in an incident known in the West as the My Lai Massacre.
The Trump administration on Thursday blamed the Russian government for a campaign of cyber attacks stretching back at least two years that targeted the US power grid, marking the first time the United States has publicly accused Moscow of hacking into American energy infrastructure.
"Saudi Arabia does not want to acquire any nuclear bomb, but without a doubt if Iran developed a nuclear bomb, we will follow suit as soon as possible," Prince Mohammed bin Salman told CBS in an interview that will air in full on Sunday.
It marked the first time such large crowds of people fled the enclave since the government launched a fierce offensive to recapture it nearly a month ago.
The UN human rights office said on Thursday that Mexican authorities had tortured dozens of people in connection with an investigation into the 2014 disappearance of 43 students and called for any evidence obtained under torture to be excluded or invalidated.
"It's pretty stark right now. The signs are not good for the US. It is getting richer and richer but not getting happier."
PM Theresa May said Britain would also introduce new measures to strengthen defenses against hostile state activities, freeze Russian state assets wherever there was evidence of a threat and downgrade its attendance at the soccer World Cup in Russia this summer.
Stephen Hawking, who sought to explain some of the most complicated questions of life, has died at 76.