It’s Not Just Facebook That Knows A Horrifying Amount Of Stuff About You. Following the recent Cambridge Analytica scandal, many people are expressing concern about Facebook and how much it knows about them.
“If the product is free, you are the product. If they’re making money, they probably have a lot of your data to sell.”
Google is pretty much the master of collecting and monetizing big data. Apple knows a lot about you too.
TomTom obviously has a lot of data on where you’ve traveled. Amazon Alexa is always listening with microphones in Echo always on.
Twitter last year they updated their privacy policy in order to collect more data. 
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Tomi Engdahl says:
INDYTECH
FACEBOOK EXECUTIVE DEFENDS LEAKED MEMO SAYING GROWTH IS GOOD EVEN IF ‘SOMEONE DIES IN A TERROR ATTACK’
https://www.independent.co.uk/life-style/gadgets-and-tech/news/facebook-vice-president-andrew-bosworth-leaked-memo-the-ugly-growth-a8280771.html
Andrew Bosworth backtracks after 2016 post argues social media success is welcome even if connecting people ‘costs a life’
“We connect people. Period. That’s why all the work we do in growth is justified. All the questionable contact importing practices. All the subtle language that helps people stay searchable by friends. All of the work we do to bring more communication in. The work we will likely have to do in China some day. All of it,” he wrote.
But he later admitted that connecting people “can be bad if they make it negative”.
Its release comes at a sensitive time for the social media giant, which has spent recent weeks striving to reassure users that the company is acting in their best interest.
Facebook has faced a global outcry and sharp questions about its privacy safeguards after reports revealed that an independent researcher passed information covering some 50m users to the consulting firm Cambridge Analytica