Yahoo Joins Google, Facebook, Twitter in Warning Users of State-Sponsored Attacks http://news.softpedia.com/news/yaho...users-of-state-sponsored-attacks-497999.shtml
Microsoft to Warn Users of State-Sponsored Attacks http://www.securityweek.com/microsoft-warn-users-state-sponsored-attacks
Microsoft refutes reports it didn't alert victims of Chinese state Hotmail hacking http://utcecho.com/2016/01/06/microsoft-refutes-reports-it-didnt-alert-victims-of-chinese.html
Twitter’s silence deafening on state-sponsored attacks https://threatpost.com/twitters-silence-deafening-on-state-sponsored-attacks
Google will make it clearer if you're being attacked by a state-sponsored hacker http://www.neowin.net/news/google-w...re-being-attacked-by-a-state-sponsored-hacker