Facebook launches ThreatExchange, a social network for sharing information about threats. The social network says it’s working with partners including Pinterest, Tumblr and Twitter. The company says its built a system to ensure that the data isnt shared widely. The system is built on top of the companys internal ThreatData system, which allows users to share information about potential threats to each other. Facebook: “When one company gets stronger, so do the rest of us. That’s the beauty of working together””]