Facebook, Google, Microsoft and Twitter agree 'anti-terrorist' pact

Facebook, Microsoft, Twitter, and Google-owned YouTube have all agreed a pact to help curb the spread of content they define as “terrorist” with the companies co-creating a database that will exclude such material from their social networks. 
Each company has promised "swift action” against “content that promotes terrorism on our hosted consumer services” with the the creation of a shared industry database of “hashes” of content geared towards terro