of its users was apparently used for political purposes before the 2016 election. in massachusetts attorney general is now opening an investigation into facebook and data firm tied to the trump campaign this after a new york times report that a cambridge analytical used personal data from 50 million facebook users without approval. facebook suspended the company for violating policies and now launching an internal investigation. cambridge analytic a denies wrong doing. let's talk it over with matthew rosenberg for the "new york times" and cnn security analyst. how did this happen and exactly what is the allegation here? >> so this happened in 2014, cambridge analytica founded by merser and steve bannon. they wanted what they've been promised by the people this company that they could build them a tool that could map the