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Social media tools like Facebook and LinkedIn collect a lot of data about you that they use to share with advertisers to deluge you more targeted ads. It's not hopeless. Here are things you can do to stop it.
Here's what is going on behind the scenes every time you use a social media site from your PC or your mobile device.
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Image: Social Munch
OAuth is the Open standard for Authentication. OAuth makes it easy to log in to one site using the credentials supplied by one of the other social networking sites. It uses access tokens to give server authorization to third party clients with the permission of the end user.
Giving authority to a site such as Pinterest the ability to use your Facebook, Google or Twitter login gives Pinterest the ability to data mine all of the information you have given to the other site. Pinterest does not need to collect any information from you. it already has this from Facebook or Twitter.
Pinterest will then suggest connections for you to follow on Pinterest based on your Facebook friends and the pages you follow.