Well, data mining is cheaper than it ever has been. Sending surveys in the mail was the technique in the past. > From: Heather Howard <http://www.gmail.com/~hhoward40> > Date: Sat, 17 Mar 2018 10:34:50 -0700 > > Scary - major Big Brother. > > From The New York Times: > > How Trump Consultants Exploited the Facebook Data of Millions > > Cambridge Analytica harvested personal information from a huge swath of the > electorate to develop techniques that were later used in the Trump campaign. > > https://www.nytimes.com/2018/03/17/us/politics/cambridge-analytica-trump-campaign.html