PALO ALTO, Calif. — In late 2013, an A.T.M. in Kiev started dispensing cash at seemingly random times of day. No one had put in a card or touched a button. Cameras showed that the piles of money had been swept up by customers who appeared lucky to be there at the right moment.
Facebook has launched ThreatExchange, a social network of sorts designed to allow companies to share information and intelligence about cyberthreats. The move is the latest example in how an age of cooperation may be emerging as companies increasingly battle cyberattacks of various stripes.
