Humans are social beings who need to communicate. Social networks have always existed but now, in the digital world, the rules of the game change. Digital social networks offer many possibilities and, as tools that they are, they are neither good nor bad, it depends on the use we make of them. Through social networks we access information of all kinds and we communicate with people, companies, institutions or political parties. The difficult thing is to know how to differentiate true information from false information, which is why there are already studies focused on the uses of social networks. Other studies focus on how to help communicate better, how to apply them to solve problems related to health or how to avoid addiction to networks.