It has been many years since the first telephone was created. The only way for anybody, until 40 years ago, to contact some friends or relatives was by writing a letter. This could be sometimes boring and stressful for everyone waiting for some news from someone. Just thinking about the time spent writing and sending a letter to anyone living in another city, town, village, or country. Nowadays, because of mobile devices, everybody, in real-time, can keep in touch with their own relatives or friends. That is an amazing step closer to the future. Because of all the social networks, I can find on my mobile phone, I can know everything about other people's lives anytime I want. By using a simple way to say, we could believe that "today, everyone is the hacker of everyone"; that is a breaking point from the ancient technological ages, that is the fourth industrial revolution: everyone could chat or type a message in order to talk about something with another person on the other side of ...