Social networks are becoming larger group of supporters. In particular, Facebook is increasingly eager visited by Internet users. More and more people assume this is the so-called social networking site account and give them information about his personal life. Thus, any Internet user can find out very much information about us. And we do not see any danger in this for himself. We are confident that together with the liquidation of our accounts on social networking site that is Facebook, for example, no one will have access to our information deleted. We forget, however, that each of our actions on the internet always leaves a trace.