Contextual integrity's decision heuristic and the tracking by social network sites

The findings of our experiments showed that social network sites (SNSs) such as Google Plus, Facebook, and Twitter, have the ability to acquire knowledge about their users' movements not only within SNSs but also beyond SNS boundaries, particularly among websites that embedded SNS widgets such as Google's Plus One button, Facebook's Like button, and Twitter's Tweet button. In this paper, we analysed the privacy implication of such a practice from a moral perspective by applying Helen Nissenbaum's decision heuristic derived from her contextual integrity framework in order to answer the question of whether or not an online user's privacy is being violated by this practice.