Everyone is now really looking into how much data these big companies have about you. You will be surprised, to say the least.
With a few clicks, I learned that about 500 advertisers — many that I had never heard of, like Bad Dad, a motorcycle parts store, and Space Jesus, an electronica band — had my contact information, which could include my email address, phone number and full name. Facebook also had my entire phone book, including the number to ring my apartment buzzer. The social network had even kept a permanent record of the roughly 100 people I had deleted from my friends list over the last 14 years, including my exes.
Needull in a haystack 
Thank you for sharing. I had no clue. Knowledge is power!