This is a very good article pointing out the invasive tricks and policies, which are hiding behind our social media experiences. Data gathered behind our backs is being used to create a new form of automated marketing, which is specifically targeted to the individual users. This marketing appears as recommendations from friends but in reality, it is nothing more than the slick data harvesting of your surfing experiences and personal information relating to your online preferences which are then used to make you a target of this “Zombie Marketing.”

Read the full article here:
Google, Facebook, And The Rise Of Zombie Marketing – Forbes