We live in an increasingly globalized world in which the way people relate to each other has been changing during the last years. This globalization is more than economic interdependency, it has its technological element, as well. For instance, social networks' appearance before 2004 nobody would have expected to be in touch with friend through a web site. In considering how technology has evolutioned, there are some questions which arise. To begin with, Facebook, one of the most recognised social networks all over the word, not only has created a safe and trusted environment for people to interact with other using their real identities, but it also has made them worry about their privacy. It is known that in Facebook your personal information may be available for the public domain. In general it is recommended that people should be responsible for the contents that they upload on web sites. According to last researches, Facebook has more than 850 million users. It seems that