How much does Google know about you? –podcast

Alex Hern on how Google's use of personal data has potentially helped create a new age of mass surveillance. Plus Lois Beckett on the response to two mass shootings in the US

Google's story is one of extraordinary growth. From its days as an insurgent startup, it now dominates internet search in most of the world and has branched out into video sharing, operating systems, productivity tools and now self-driving cars and artificial intelligence.

Much of its success comes down to its ability to raise huge revenues from selling targeted advertising. In order to do this effectively, it relies on vast amounts of personal data.