This is the only way to be able to put "Likes" or similar in your profiles in the Social Networks you use.
Facebook, Twitter, Google+, Flickr, Pinterest, and all the others; give users the ability to share content with the world.
Millions of people use these Social Network every day to keep in touch with friends, upload photos, share links and videos, and learn a lot about the people they meet.
Privacy policies vary from Social Network to Social Network and depend on privacy settings set in these networks.
Go here for more information on the policy of Google: click here
Go here for more information on the policy of Facebook: click here.
Go here for more information on the policy of Twitter: click here.
Go here to learn more about the Instagram policy: click here.