4 ms·

http://www.bbc.com/news/technology-28682686 http://www.bbc.com/news/technology-28682686

• darklajid 11y ago
  That article mentions both Microsoft and Google, and closes with "In addition, the software is used by Facebook and Twitter, among others." (referring to PhotoDNA to scan all your pictures in all your mails - only Google's and Microsoft's reaction to matches is described in the article though, I guess we can infer that Twitter and Facebook would do the same).